All three bring something different to the table and if I had to make the decision of who goes and who stays it would be very difficult.....
1) Brooks...As you say, he is a one trick pony. he's a shooter, period.
2) Lee... Good defense but the guy is a hit and miss shooter. when he's on he's good but when he's off he's horrible.
3) Crawford...sometimes he is just out of control and tries to do too much.
Lee has been around and really showed nothing last year. Brooks has not seemed to grasp the opportunity to prove himself, so for me, I would keep Crawford and dump the other two or try and package them with Hump and Bass for a draft pick or another young piece that fits this team.