unnecessary. Bobcats don't need to much of anything in free agency this year. Letting DJ walk is probably going to happen, and amnestying Tyrus doesn't make much sense as it would essentially be paying him to play somewhere else. The best thing to do there is to just keep him and bench him if he isn't going to improve.
I'm all for getting decent back ups but none of the guys you mentioned are game changers and therefore aren't worth spending money on.
That starting lineup you posted is pretty much the exact same as its going to be anyway if we win the first pick. Antwan Jamison is coming here, so no need to attack there. And basically that just leaves JR Smith... and honestly I'd much rather continue on with Gerald Henderson as the starting shooting guard than to sign JR smith to any kind of contract. And I think a much better point guard option than Aaron Brooks can be had for the same amount of money you suggest. Most specifically Raymond Felton.