Hate to see all this coming. Honestly even tho he is ur friend it doesnt mean he cant be hacking or accused of it. XI doesnt ban just because they feel like. In every case, the evidence has been brought and they make the right and fair decision. The good thing about XI is its not just one person lookin at it and going oh hes hacking, its several. U go thru the chains. Im not saying he was but even U said u werent sure if he did or not. So why give up ur tags then, doesnt make sense to me. Seems like an easy out but thats me. Anyway, take care in ur adventures.
P.S. I have had a situation like this myself, the friend wasnt accused of hacking but he was a member of a clan that we forbid to play on our servers. I stood up for him the best I could but he is his own. He came in posted, got it handled. I didnt give up my tags tho, thats stupid.