Who exactly are those 6 owners?
The ones that were assigned the job of negotiating Goodell's extension and they were given the authority to finalize the deal on behalf of all of the owners. It was at that point Booger should have raised his concern, although internally, not after the Elliott ruling. He voted along with all the owners to empower those 6 owners, ATL, HOU, KC, NE, NYG and PIT.
Kraft, Mara and Rooney comprise the power base of the NFL, along with Booger, and none of those families like to be threatened. Now, consider the difference between Booger and Kraft in this. Booger reacts after the Elliott decision like a spoiled child and Kraft shows some anger as well but decides on what is best for the league, not just the Patriots. And he had been fined both money and draft picks and lost the best QB in the league for 4 games over something just as controversial as Elliott's for the lack of proof. Think he is going to take kindly to being threatened by the likes of Booger in the media.
If Goodell is out to get Booger and the Cowboys, as some have suggested here, what the hell has he been doing to the Patriots? The man was invited to attend their parties at Kraft's and has fined the HC, taken draft picks and suspended the face of the NFL, which is a hell of a lot more than he's done to the Cowboys.