And that's great, he can have Tyrone's wingspan which will do him no good if he doesn't have the feet and the balance at tackle. I'm not looking forward to players doing spin moves or him being on his heels with a bull rush.
He may end up being acceptable at RT, but we've had "acceptable" at RT for about 6 years now and it has caused our QBs problems.
You said he is not built like an OT. That was a false statement. Most OTs are not built like Tyron and RTs are likely farther from the prototype (Tyron) than LTs, on average.
For this season he just needs to be better than Doug Free which is a very low bar.
If he is a C at RT this season then they can move him back to LG next season where he is likely an A.
Free was a C at his peak and an F last season.
They always have the option to play Green at RT and move Collins back to LG this season if Green is healthy. Green proved his ability in two starts at LT in the middle of last season.
They couldn't really go the other way (Keep Collins at LG in training camp and then move him to RT when Green gets injured).