yeah I know that, but if you think about it, before Pokemon Trainer was confirmed, nobody actually believe he was going to be in, and anybody who suggested him was flamed to hell (and when he was confirmed, those who suggested him laughed at people faces), what I mean is that you never know. Even if Pokemon trainer is an important character in Pokemon (duh), his chances where the same as Daisy's chances right now, PT because nobody imagine how he would fight, and Daisy because is not that important to the Mario franshice.
I'm not saying "PT is in, so anybody can get in", but that after PT confirmation, crazy character ideas dont exist anymore (with exeptions oviously)