Gronk has had a multitude of frightening and often recurring injuries, some in spots that always bode ill for long term football participation. He's had both lower back and neck issues and surgeries, ACL reconstruction, and of course numerous surgeries to try to repair the nine-car pileup that used to be his forearm. Those things alone ought to disqualify him from the #1 for any sane drafter, but there's more to consider. He's carrying all this injury baggage into games where he plays a high-impact style at a high-impact position while carrying a massive bodyweight. He's aging, which isn't so much about his age as his mileage. And he's potentially without the guy who buoyed him to the top of his profession to start the year; possibly for as much as a quarter of the season. And all that would be awful enough if there weren't a history of those things knocking a younger, fitter, more resilient Gronk out of the lineup so often -- but this isn't a guy that's steered clear of the DL. Do we really trust older, wobblier Gronk to do so?
I won't dwell on this any further, since there is clearly a case to be made for the guy from a pure value standpoint. But to buy into it, you'd have to believe hook, line, and sinker into the (to me) laughable idea that "you don't predict injuries." You predict EVERYTHING in this hobby, from health, to scheme, to chemistry, to strength of schedule, to production. I urge people not to go into a season of this info-based game voluntarily playing from an info-deficit.
But if you want to roll the dice on 16 healthy games and no Brady suspension issues...
I think there are about 6-8 guys you can make a good case for taking #1 overall. I just don't happen to see Gronk's case as all that good.