I can't see it being Lin doing LA Tour dates, if only because I can't see him doing that to Michael. Maybe down the line as an temporary replacement, or a place holder between someone leaving and someone new coming it, but I can't see him jumping in mid schedule on someone, he's way too supportive of a guy, he seems to thrive on cheering people on and seeing others succeed. If Michael hadn't just gone on a week vacation like a week and a half ago, maybe but as it all sits right now, I think it would be weird.
As far as using the Lin-ism, I'm pretty sure their social media has adapted some of his more commonly used phrases in the past, it could have to do with him, but I don't think that necessarily means it is. I am very curious one way or another though.