The Eli to Steve Smith correlation doesn't really shed any light either. Was Steve Smith's success with Eli, due to Eli? Was his failure post-Eli, due to missing Eli's "blessed touch?" Unfortunately, SS's injury makes it impossible to judge.
We can say that in the Eli era, no ex-Giant receiver has matched their success here elsewhere, though Manningham is coming closer than most. However, you can say the same for RBs. That makes it a bit sketchy.
Ultimately, I would say it's best to reserve judgment until the body of work is complete, as gmen46 advises.