Finally, the Pats had the PERFECT defense called out for the 4th and 5 play. Had Sims not held Ryan (or it had been called properly by the refs) then Clay is down with a loss of 2. Instead, Ryan was held. McCourty over-ran the play and was taken out by Claybo. Fletcher got held and taken down and nearly wiped out Gregory who was the one who was able to get an arm on Clay and make the play.
I normally agree with you, but you are wrong on this play. Refs will not call holding when a TE or WR is in a good blocking position and have their hands inside the shoulders of the defender. That's exactly how Sims was blocking Ryan on the play. Whether he grabbed the jersey a bit is irrelevant. Guaranteed if you pull up the replays of all the Pats screens over the course of the season, there are multiple examples of Patriot blockers doing the same. If you want this one called, then you should be arguing that all of those should've been called too.
Also the Patriots did not have a perfect defense called to defend a screen pass on that play. It looked like they intended to put pressure up the middle, and the Dolphins guessed right. That said, some guys almost got back into position, but whiffed on the tackle (e.g., Fletcher and Gregory). If Gregory knew how to tackle properly (not wildly dive leading with his shoulder), he had a legitimate chance to wrap him up short because Fletcher slowed him up.