If he is able to show up on the field, maybe. But health is an attribute, which was part of the point I was arguing in the debate KFP was referencing (in addition to their proximity as players), and Gronkowski - for all kinds of weird reasons - struggles to stay healthy. When he is not on the field he isn't helping, and even when he plays hurt he can negatively impact the team. Gronkowski being on the field in Super Bowl LXVI (I think.....the second one vs. the Giants.....) was, to me, a material factor in them losing. He wasn't healthy and the Giants figured that out in the first quarter.
Even today, with Graham coming off of a crappy year and Gronkowski at the height of his powers it is not clear to me that Gronkowski will end up with better career numbers than Graham. We are all grown ups here, we can say that Gronkowski is highly likely to be enhanced somewhat significantly (for those reading me for the first time, I believe that every single player in the NFL takes PEDs or has taken them at some point, even kickers and punters. I am not saying that Gronkowski is doing something that no one else does, but I do think he is above average in his use, just like a number of Eagles and other players), so how will he age? We'll see.
But to put this to rest, I am absolutely not saying that Rob Grownkowski is a bad player. He is an amazing player. He took the Antonio Gates model and multiplied it times 5. He has fantastic hands and he uses his body aggressively in coverage to create space (and, admittedly, he gets called for it, but like all receivers who do this well, he gets away with it way more than he draws flags, which is the key). He bangs porn stars and does dumb shit with his brothers, there is a lot to like about the guy. But Jimmy Graham is also an amazing TE. They both are more likely to end up in the HoF than not, they just need to stay healthy.