My two cents: That's a tough one. Chase Edmonds -- and I say this a guy rostering him and hoping for the best -- is not likely AZ's full-time back when the season comes around. On his own team he has feature back competition from Eno Benjamin and UDFA Johnathan Ward. They might draft somebody. Sigmund Bloom doesn't necessarily think this is the case, but other people are not as confident in that. They point to his usage when Drake was there. Drake was actually a bit of a workhorse. Edmonds didn't get a ton of usage despite his point total from last year, which was touchdown-dependent (I know. I had to play him at times in a deep league). So beware. As for Shenault, he and Chark, Jones, and a likely rookie WR are a lot of mouths to feed in JAX, though most fantasy sites list Shenault as an offseason winner due to Lawrence. Where do the targets and touches come from with that many guys around?
So, caveat emptor. It's not a smash accept to me. I might rather have Robinson with Dalton than those two. I think you get starter points out of Robinson, with Edmonds and Shenault, it's a coin flip.