For sure I think its more important for guards to not get lost in space, especially if Roman's going to be getting a decent amount of say in the run game this season. At Right Tackle, Robinson would be sealing off defenders more often than not and I think he should be successful in that role. Guys like Anthony Davis and Seantreal Henderson had decent stints at RT under Roman and those are both guys with some pretty similar limitations to Robinson.
When I say Robinson is a pusher, Im more referring to his bad habit of getting too high and trying to rely on his upper body strength too much- kinda like if you were to push someone into a pool.
Either way, it's not easy for a player to make a transition to guard- we've all seen it attempted and failed more times than it has succeeded (such as DJ Fluker, Luke Joeckel, Ty Sambrailo among many others). Robinson also has issues with having never played any position but left tackle in his entire College/High School career- so regardless of if hes on the right side or at guard, that'll be an issue for him.