We'll see? I was not impressed after the Rams drafted Donnal, thought it was a reach and when he played his first game at LG, it was a disaster. However, later in 2015, he started against the Ravens at RT and was having a good game before his injury and last season surprised especially when he was called upon to play LT against the Saints.
Overall, I understand they wanted Havenstein at RG because they thought he got a better push in the run game, but in the Charger scrimmage, Brown struggled protecting the Quarterback in pass protection and that is why they went back to Havenstein at RT and thought having Brown play guard in what he was more familiar with, he would play well, but Brown did fine in pass protection against the Cowboys, but was an epic fail with his run blocking.
Again, I'm not sure about Donnal's injury, but I like to see him get some reps on the right side teamed with Havenstein before I jump off the Tallahatchie Bridge.