It's sounding unanimous on Rapp--bullseye.
Long: needs work. He was hit and miss because he seemed late on plays. That's just "thinking instead of seeing." I don't know how much he will improve between now and after the next camp, but I wouldn't consider him as a front runner to start at any spot right now.
Edwards: looked bad in camp, was impressive at LG, was up and down at RG. Teaming with Evans seemed like a good idea though. I can easily see him starting next year. Ideally, I would like to see him at LG if Noteboom can handle LT. NBoom looked much better at LT as a rookie than did at any point this season at LG.
Evans: flashed potential in a couple games and did a decent job, considering, but I'm not completely sold on anointing him as the new RT.
Henderson: meh. Yeah, I saw a FEW good plays, but he's too small to carry the load. If Gurley vanished tomorrow the Rams would still need to draft another RB. That's why I'm not so sure they shouldn't consider doing just that if the right guy is there. The Rams are lacking speed at the position overall because I just don't see Henderson as a work horse.
I think the Rams did well in finding at least 1 starter at both OL and in the secondary (Rapp and Edwards). Should Long and Evans become starters, then the 2019 draft ends up being significantly better in trying maintain a contending roster.