I have always viewed "boy-led" has creating opportunities for boys, not taking them away.
Sometimes these opportunities are opportunities to learn, sometimes lead. I am involved in the learning. I teach, but I will not do it for them because that cheats them out of an opportunity to lead.
I just went through a discussion about 6 months ago when the boys were learning their knots. I showed them how to tie them, then let them have at it to learn. I did give out the caveat that there will come a time when we get to camp, it's going to be dark, it's going to be raining, and the quicker you can do the knots the quicker you can get the tents up and your gear kept dry. No one believed me at the time. Well about a month ago, BINGO, it was late, it was dark and it wasn't just raining, it was pouring. Everyone was soaked and the weekend hadn't started. They struggled, they cried, they helped each other and finally one boy came to me and said, is this the lesson on knots? Yep. Well last Sunday evening we were doing training on First Aid and the boys were goofing off. I told them there's going to be a time when you will really need to know this or someone you care about is going to suffer or even die. The PL asked, "when that time comes will it be dark and raining?" I told him if it isn't you're going to feel that way anyway. They paid attention and worked seriously for the next hour on the training processes.
One of the major hurdles in teaching leadership is to give full authority to the boys. This is not something many adults are willing to do. Failure is not an acceptable outcome in our society. Yet, in the BSA program, it is supposed to be a time where failure is one of the necessary stepping stones to leadership. For those who are too afraid to fail, they will never become even mediocre leaders.
In order to be boy-led, one needs boy leaders first.