Charlo is used to being a big fish in a small pond. I wonder how much his power goes up with him. It just might. But his boxing skills aren't getting any better as he is getting bigger. He was always slow. There's not a lot to his style (not that there is to Lemieux, but he's at least an established quantity at MW). Really, there's not much to say for Charloo. Lemieux is there to be hit, and maybe Charlo is able to work him over. It could happen. But Lemiuex is a big bastard with a left hook that feels like a mule kick. He puts Charlo on his ass and there's no way I get surprised by that.
I heard from my boxing coach that some fighters when sparring him would get hit and say it felt like they didn't have any head gear on. For what that's worth.