I dunno about Podolski as a striker. He had done well there for Köln the season previous but that's a massively different style of play/situation and for us he did indeed look pretty out of place at CF the few times he played there. Not sure he really had the movement/instincts of a striker, especially in a system where your team is on the front foot and facing a lower block.
The Alexis one is the one that just doesn't make sense for me. One half against Everton. This season he tried him there by accident really, it worked, and he's gone off it for who knows why. So weird when it's so much easier to find a real good wide attacking player than it is to find someone who can perform as Alexis did at CF this season. And when Iwobi is already a superior player to Giroud/Welbeck. I wonder if Alexis wasn't happy at CF? I think it's just Wenger bullshit honestly, but have to at least suggest the possibility.
Lucas I don't really care about, he may or may not have been able to play at CF given more time but once Alexis was there it was kinda irrelevant.