Allen played better than given credit for in 2019 as a first-year starter. He's a clear upgrade to both Blythe and Corbett, as much as I like Corbett he showed me he's a good OG and a mediocre center. I've believed in this bunch of OL guys when everyone was giving up on them. This is a good OL that was marginally coached under Kromer. I knew last year that Kromer had to go and McVay finally pulled the trigger and replaced him. A year late is better than not at all.
There was a reason Snead took him in the 4th round. Center is not a position you simply move an OG into without a year maybe 2 training as an center. This is why Shelton is probably the #2 center. The center is the green dot guy of the OL.
When you see a QB and C pointing to a defensive player, they are pointing to who the MIKE is by alignment on each snap. The alignment of the MIKE tells the OL and QB what they should expect and how to block the play. In today's NFL, the MIKE isn't just the middle ILB.
Speaking of green dots, having Fuller as a green dot player would signify he's likely to be a 3 down player. That said people don't seem to know that there can be as many as 3 green dot players on a team which is especially true when a secondary player is one of the 3. The reason the NFL doesn't give every player a helmet radio is that the NFL doesn't want to take the 12th man out of the home-field advantage. With the Rams I expect 2 DBs and one LB to wear that green dot in rotation on any given play.