Board Thread:General Wiki Discussion/@comment-5486221-20151231012039/@comment-5101200-20160116221640

I think we're all forgetting Ben has the ability to switch aliens without pressing the Omnitrix while in alien form (at least I'm fairly sure he still does). So, it doesn't matter if he can't reach it on his back or if it's too small for his chest (well, it matters that he shouldn't have it on the chest while Grey Matter) because he can switch without pressing it. He just doesn't because, as evidented by the show several times, he's an idiot.