The school President, the AD, etc. all are most concerned with CYA. That is, how will they look of he is allowed to re-enroll and then re-offends? So, the safest decision for them is to not let him return.
If I were Frenk, I'd have AW come to my office for a one-on-one meeting and get the sense of who the kid is and what he says about the future (i.e., how sincere his promises regarding fis future behavior are). If I was positively disposed, I'd tell him welcome back with the stipulation that he's on a "last chance" deal. Anything negative, he's gone for good. Then ... cross my fingers and hope he's learned from this nightmare.