I understand the scheme the Rams oline plays. But like all teams they mix in inside zone and occasionally power. But on short yardage the Rams struggled last year and one aspect was their inability to simply line up and blow the dline off the LOS. They resorted to all sorts of other things. One of those things is the QB dive which I'm not a fan of as it exposes Goff to hits, i.e. injury. If your oline can drive the defense off the LOS you give it to your RB. Why do you think Goff was diving for it so much? His dives were directly over center or to the left, not to the right where Blythe was.
One big telling point with Allen vs Blythe as the starting C is their physical makeup. Allen is built like a OG only a bit shorter than you would like. But his longer arms gives him a better play radius and he's simply a bigger player. I would much rather see Demby or Evans at RG this year. Evans would make sense as he then can switch sides to LG next year when Noteboom moves to LT.
The Rams don't want a finesse oline. They want a big dominating unit. Don't overlook Kromer's input on player selection as he is now the run game coordinator. Everywhere he's been Kromer's olines have been known for their physical play. Case in point, Dallas wants to dominate the run game. All their interior oline are at least 6'3", and between 300-315 lbs. All are long armed players. Those long arms allow them to keep defenders off their bodies and leveraging them.
So Kromer goes with Allen who is built like a OG with longer arms than Blythe to start at C. If he wanted a longer armed bigger guy at C will he stand pat with Blythe at RG when he has better options? This is why I've been saying I think Blythe won't be a starter on this team this year. He's in a contract year so unless he wants to stay as a backup next year I think he's gone. IMO Kromer will be allowed to play his guys and build the oline his way. Finesse isn't Kromer's style. He will play it when he doesn't have the players, but when he does IMO he will opt for the bigger, stronger oline.
Remember the original starter at RG was Jamon Brown, 6'4", 323 lbs, with very long 34" arms. Jamil Demby is 6'5", 321 lbs and just under 34" arms. John Sullivan is 6'4", 310 lbs with 31.5" arms and Brian Allen is 6'3", 303 lbs and 31.5" arms. Austin Blythe is 6'3", 298 lbs and 30" arms.
They played Blythe when Brown went down because he was a 3rd year player and Demby wasn't ready to play. IMO Demby was drafted to eventually replace Brown because I think they knew of his substance abuse issue. The fact they released Brown so quickly upon his return would seem to validate that assumption.
Making Kromer and Waldron coordinators was a very shrewd move by McVay and Snead. It makes it harder for teams to keep poaching their coaches. They can block lateral moves so teams would have to offer them OC and DC positions to get them. But in doing so IMO it would seem to give each one more say in player selection. To build and structure their units accordingly. I think Kromer is rebuilding the oline with guys much like they had to begin the 2018 season. Bobby Evans is in that physical profile fit to play OG as well which is why I'm sure he's slated to take over at LG next year. Edwards fit's their OT profile and it's why I think he's slated to be the swing tackle.