Spot on, in my opinion. Personally, I would redshirt him all day over working a rotation, unless he comes in looking like Luke Keuchly from day 1.
Everyone seems to be foregeting about Huff and Waters when talking about options. There are a lot of connected people very high on Huff right now (or getting high by huffing, I may have misinterpreted). He could be solidified as the Mike by the time Carter rolls in, leaving Carter as a freshman, to compete with the likes of Lynn as a senior (who I think will be on an All-B1G team before he leaves).
You also have to consider the fact that the Gophers were in the nickel package a ton last year. There just aren't three LBs on the field much anymore. That's only going to increase as the college game continues to evolve into a passing circus.
Really, he'll likely have to beat out at least five different experienced, quality athletes (Poock, Williams, Celestin, Huff, Waters) for one spot in the nickel (Lynn will absolutely be a starter from here on out, obviously), as opposed to three (Poock, Williams, Celestin) for a spot in the base 4-3, like a lot of people are thinking. That's a lot to ask of a kid who has to bulk up and learn the defense.