I think it's more a matter of adjusting his technique at times. In 3-LB situations where he's in the middle it is more about getting lower, his feet, etc. vs. the run-and-chase from the WLB spot. Which is what they showed Singletary focusing on with him. Not that he didn't know the defense.
But I also think that given the Rams, like most teams, play so much nickel that 2/3 of the time they're going to be in 2-LB sets which he's very used to.
Ogletree was off to a tremendous start in the first four games of 2015. I think he'll be fine at MLB.