let's get it straight, i never saw weah play. i just checked his stats, and my impression is that for an allegedly attack minded, quick player his g/a numbers are very low. he still gets the benefit of the doubt from me.
just a general remark on players being able to play multiple positions: i usually like them. versatility is rarely a drawback. as a squad player, caceres was an excellent option because for one salary, he was the backup for at least 3 positions. when vidal was moved from b2b to kinda trequartista, everyone had their doubts, and it worked because vidal could adapt. mandzukic as a one of a kind defensive winger instead of playing in his natural position, that saved a few seasons for us. danilo arrived as a fullback, turns out he's a solid cb, that's also a nice surprise. licht was equally good as a fullback and as a wingback too. and so on, this is really a long list. bottom line is that versatility won't hurt.
i wish chiesa could actually play as a wingback, bremer would be equally strong in both 3 and 4 man defenses, or kostic wouldn't only work with a 3-man backline behind him. it would make implementing any formation a bit easier.