Good summary.
Outside of QB, this is the unit that has the most question marks, IMO.
Reading between the lines, I'm not sure the coaches are as optimistic as they're trying to sound. The comments about Nixon are particularly interesting. Basically, they are saying he needs to mature, but, frankly, he should be beyond that by this point of his career.
Given that Golston will be seeing a lot of double-teams, this unit needs Nixon to take that step and for Heflin to get up to speed. If those things happen, and Evans continues to progress on the edge, things should work out okay.