Armin was never in the show...plain and simple.
He literally showed up on SATURDAY morning, unannounced...no notice, no meeting (which is mandatory), no nothing.
It's really quite simple...it simply would not be fair to the other 17 competitors who did have a contract in, did notify the promoter, did attend the meeting, etc....it would set a bad prescedent to allow pro's to walk up and jump in at a minutes notice.....how many other guys would just wait and see who enters, or how they look on game day...only to jump in or bail out at the last minute? BAD IDEA.
This aint the NPC...this is the IFBB, and any profesional should have his shit together and have some idea that he's going to be competing, especially when the show and date has been announced since last year.
BTW...Armin wasn't mad, he didn't really care if he was let in or not. He knos the rules and even said himself that he understood if the answer was no.