I didn't have time to read the entire thread so excuse me if I missed something. Coming out of a pack where our Bear Den leader did almost NOTHING I would say that if you have one who the parents like and who keeps the boys active you might do better to stick with her.
Our Bear den leader would come in with nothing planned and start thumbing through the book (several times my son's book because she forgot hers.) trying to figure out something she could do for the night. When I offered to help she wasn't interested and when I brought in supplies for making decorations for the blue and gold banquet based upon one of my son's suggestions (That he spent hours researching after he was asked to by the den leader) I got a lecture for making her fell bad because she wanted to do something else and I had advocated (argued according to her) for using at least one of my son's ideas. Not one of the other boys had spent the time coming up with one so I was not advocating for their idea over his. The ideas proposed by her and another parent required the boys to do all the work at the B&G set up (making a tent out of plastic and animals out of 2 balloons stuck together with faces drawn one them) and nothing at the next 2 meetings that were supposed to be set aside for that. When my son suggested that his idea gave them a better chance of winning a prize for decorating because it involved making circus animals out of recycled items he was told that he was too focused on winning. (He is but that shouldn't be a factor when they told him that they needed something good because their would be prizes for the best.) When we were asked to leave the pack about a month ago it was because I complained that the required den dinner had been canceled by the den dinner just hours before camping trip started. At that point in early March (To spite weekly meetings) we had not been on a single outing to fulfil the Bear requirements for advancement. They hadn't done any of the group activities like building things that were listed in the book. Well other than the Whittling Chip which was lead by another adult. They did have a plan for the carnival. Go to the fair and let the Bears show the Tigers or Wolves how to play games. I had made it clear that I did not approve of that idea. It was not a lesson that I wanted my son taught - take the easy way out. However at first I assumed that it was that they had no idea how to throw a carnival and that my experience doing so as a child would be welcome. I offered to oversee everything. The den leader told me "It's not up to me it's up to the scout master." Then she told me "SM says that it will cost too much." So I told her "Oh not the way we did it when we were kids. I can do with not cost to the Pack. I will even supply some small prizes." In a very cheerful way because I was still under the impression that they would prefer follow the guidelines and to do something that would be a lot more fun for the boys and a lot hassle for me than taking my son to the fair on a day that we didn't plan to go. But they had no interest in doing that. And they had the perfect time to do it because the Blue and Gold theme was Circuses & Carnivals.
Oh and I discovered that we were expected to pay for the games they were required to play. Later I discovered that I was a nagging parent. So the boys sat, and sat, and sat at the meetings while the leader read out of the book and told them what to bring the next week. And then twice forgot what they were supposed to bring so she wasn't prepared for them to present it. Quite a few times she was late and I went ahead and after 10 to 15 minutes of doing nothing I got the boys giving their presentations or sharing things related to cub scouts since no one knew if she would be there. So yes I went to the Scout Master and asked for more. As a nagging parent I was told that there wasn't a place for my son in the pack. (It wasn't said so nicely.) So the boys will likely get their Bear rank at some point but they really will not have learned the things that they were supposed to from the experience. They will have wasted many hours sitting doing nothing with a den leader who clearly didn't care if they had fun or learned anything. But maybe she filled out her paperwork. Somehow I doubt it though. My son hadn't gotten any of the things that he had earned other than his chip. She was always going to turn them in next month. The den lost several boys and at least one other mom is planning on leaving. But 3 of the 4 boys who I know of who are left - 1 belongs to the DL and 2 other belong to someone who I believe is going to be the new ScoutMaster next year. Hopefully for the sake of the boys who are left he will expect more. But I don't have much hope of that because if I understood correctly he is new to scouting and his wife really didn't seem to care if the den did anything other than let the boys play. I was sad for my son that he wanted more and instead of being rewarded for putting in the effort the adults around him made him feel like he just needed to follow their lead. I keep reading her about how the boys are supposed to learn to be leaders but in this pack I can't tell you how many times we heard "Some of the boys can't do that so we aren't going to try." For the song or skit they were supposed to do. For making decorations. IMHO It wasn't that any of the boys were incapable of doing the requirements it was that the DL had given up on her son and she wasn't even trying anymore. She was running the den based upon what she thought her son would or would not do without even giving him a chance to join in with the fun even if it was in his own way. (Like having him hold a flashlight on the boys for a creepy look or rattle pans during a spooky story if he wasn't able to get up in front of friends and act.) I am sorry but that is not the sort of leader that any unit should accept. Better to just send the boys elsewhere. Better to have a leader who is at least trying to run a fun filled program. In a perfect world they could do both but a huge reason that I was reluctant to become a leader was that I was afraid of failing the boys. I was afraid of being judged on how well I kept up with paperwork. Funny thing was that I never worried about failing as a Cub Scout parent. But I did.