I've watched enough NFL football (thrity years or so) to know that it isn't uncommon for lower round picks to need a couple years to get that anchor solid. I've seen it where the team played the player throughout that time, seen it where they benched him for a couple years, etc.
In the cases where a player has a weak anchor but potential, it takes the full 2 years to get there, because it isn't just eating more and hitting the gym - there's a science to it and they effectively remake the bodies of these guys, and it takes the full 2 in most cases because the transformation is that radical.
In the cases where the player is left out there during this time, the first year after a full NFL offseason tends to be an improvement but also inconsistent. Its very up and down. ***** about it all you want, but you are only shooting the messenger.