He would play. If he wasn't going to play, then why would he be in the vote? It's the same for Meteos.
Why shouldn't he win? This isn't an MVP vote, this is a vote for favorites. I'll be damned if Dyrus doesn't have one of the biggest fanbases in NA LCS
Is he still gonna play if he wins?
As far as has-beens go, Shushei would be a lot more fun. It's all for the lulz regardless, right? I mean, all-stars has nothing on SKT no matter how you slice it. The only thing that would come close is if you reassembled Samsung White and gave them a couple weeks to practice.