There are three wingers lined up at center.
Also I do not think Hughes will be healthy in time
Oshie is just an extra, I didn't mean him as a center. Many Nucks fans have also told me Miller is a center, so that's why he's there. For Tkachuk, I think he might be able to play center due to his playstyle, smarts etc. For example, Sebastian Aho wasn't a center when he was young, he learned it later.