I am looking forward to how well he handles the pre-snap shit in preseason. If he's got that down, which is possible given that he's off to a fast start in the underwear sessions, then he should be good to go as backup. And him impressing McVay and the offensive staff early on is definitely a good sign. They undoubtedly put a lot on him to try to get him ready for that backup role so no matter how you slice it good reports are what you want to hear.
But how will he do when he doesn't have a top trench group in front of him, with more diversity in the rush threats, more checks at the line to get it all sorted, and needing to diagnose safety intent. It's a lot so I expect him to have some hit and miss when the snaps go live. Hopefully he'll flash though. I expect these games will be a little bit more fun for us than usual.