Ok, I'm the one who posted the original question. I too an an ASM in the original troop. My son (currently at Life) is somewhat disenchanted with the troop mostly because of the age and maturity of the troop. The last thing I want to do is force him to stay with the troop. He appears to be pretty interested in this other venturing troop, which is encouraging. If I had my druthers and he can advance to eagle at the venturing unit, I'm leaning to let him do it. I'd rather have him be happy and want to do it because he wants to be there. In addition, it might be hard to add this along with the troop because of his schedule.
As to his mb's, there are only 2 or 3 of his eagle req'd mb's left and all would be on his own time. The last thing outside of that is the eagle project, which he's just started the process.