He didn't ask if he was targetting the muscle he was asking if it would work them. You can do 4lb bicep concentration curls and target the correct muscle and get a real nice pump after the 4000th rep...
1. Yes.
2. Of course. Its how life works. Just don't think about it. Who cares? Become friends with them if worse comes to worst.
3. See what his workout is like. Post it here, and if its rubbish,...
If you are losing weight then you aren't eating 6500 calories a day. Thats forty fice thousand calories a week. There's something you aren't telling us.