Gronk has been injured, but not the chronic multiple knee operation type. Broken arm, bad doctor is not going to affect his career. Knew he had back problems, but his treatments have been tweaks, not serious surgery like in college Knee, ankle. Any player any year could lose out, again, not chronic injuries as long as his back holds out.
People that think we get an "almost Gronk" and save a few bucks are nuts IMO. He's only 28 and likely will end up the greatest tight end of all time. Would be already without a botched surgery IMO. stats aside, he is the greatest offensive weapon, especially for a coach who wants to use those alignments.
BB has been trying to get all around tight ends for years and except for 2 1st rounders, both of whom were rather one dimensional, he's failed. Put the 50-100 TEs since 2000 in a bucket, they aren't worth half what Gronk is.