I remember when free agency first came in in the 1990s. It was said to be the end of dynasties and, to some extent, I think it was.
The pats were an outlier. They hit the trifecta as other have mentioned.
To some extent so have the Chiefs but we'll see once Kelce retires. For all of Mahomes' greatness (and he is a great QB) Kelce distorts defenses making Mahomes' reads easier. On the other hand, the Chiefs aren't 9-0 on the strength of their offense. The last two years their D has been equal to the challenge.
It will be interesting to see how TThe Chiefs' O performs against us.