Just to play devil's advocate who is the elite talent? Marcus (needs to stay healthy), Lewan, Davis (I think he is on his way), Casey, and Byard are the only guys I see. We have guys who could develop into truly elite talent (Jackson, Landry, Evans) but for the most part we are stacked with average veteran ability. One guy who I wold have put in the elite category would have been Conklin but he has regressed a lot, not sure if its the ACL still or what but since he left the Dallas game our o-line play has improved.
I think Lewan, Conklin (fully expect him to return to form), and Casey are definitely elite. I would include Walker in that as well if he comes back strong even in spite of his age.
Davis, Byard, Jackson, and 'possibly' Landry have elite potential. Some might say Byard already is.
Mariota is not yet anywhere near elite, but he is one of the franchise cornerstones and could end up being, at the very least, a very good quarterback before it's all said and done.
Guys like Lewis, Ryan, Henry, Woodyard, and Rak are nice complementary pieces; the caliber of which we will likely have to shuffle and replace as the years go by.
Given how young most of these guys are and their potential, I tend to agree with dd about our core group of guys, particularly Lewan, Mariota, Conklin, Casey, Davis, Byard, and Jackson. Idk how many of them are truly "elite" or will become elite, but I do believe letting that group simmer together into a real nucleus under this coaching staff can potentially yield some very good results.