So let's start off with the obvious. It's almost funny to project an all rookie team at this point... and yet here one is. I'm sure we all remember that a few people had Brandon Graham pegged as a possible rookie of the year at this point last offseason and obviously that didn't work out.
The kind of prospect you can start inside at guard from day one and get good play out of; looks like a future Pro Bowler to me.
I will say, that offensive line is a much easier position to predict early success with than than say... defensive end, quarterback or wide receiver. Positions like offensive line or running back are ones that usually can contribute early, so there's probably more reason for optimism about Watkins to contribute quickly than Graham last year.