Wow! Raddy, your mention of the suicidal bully are freaking me out - if the school and more importantly that boy's parents aren't informed of this or taking it seriously, I could see this being the source of misbehavior for that guy. Your son should not be responsible for taking the brunt of him working out his grief, frustration and obvious loneliness despite being surrounded by 'friends'. Sounds like he even sees something worthy in your son, despite putting him on the spot and worse (did he actually beat him up?) I hope your meeting went well but it sounds like it will be difficult.
... It would be interesting (and probably impossible) to find out whether the school has recommended counseling for the other young man/his family, but to me seems like a more effective angle to take.
