Of course that’s only 6 out of 16 games. And they generally lose at least 1. To get to the 13-3 you generally need to get to a bye they still need to go 8-2 for the rest of the schedule. Just look at the other divisions and how many different winners they’ve had in that stretch. It’s an amazing run.
A Dynasty has to be measured by championships though. As of now the Brady/Belichek teaming has five which puts them behind the Jordan/Pippen/Phil Jackson Bulls who had six. That’s part of why I’m rooting against them now...so they don’t tie that one. :)