The optimistic view:
For whatever reason, Cannon is just a better player with Scarnecchia. He played better against the Bears than he did at any point last year. His best year was 2013 with Scar. I'm hopeful he can play a solid RT this year.
I love Lewis, but he's a luxury. White is a very good receiving back and similar running to Vereen. I don't think we could rely on Lewis to carry the running load this year even if he were healthy. Simply put, Blount, Gaffney, or some new acquisition have to step up. Additionally, in 3rd and long situations this year, I'd like to see a 3 WR, 2 TE set with Edelman, Amendola, Hogan, Gronk, and Bennett. In the past, there has always been a RB on the field, but I think this gives us a "best 5" receivers look for obvious passing situations.