They didn't intend to go after Belichick. They wanted Brady and I'm sure they are thrilled the Pats are finding success without him. Brady should be declining or retiring, but he's not. See the patterns:
Favre wouldn't go away -- D pic scandal.
Manning wouldn't stop 'roiding, meaning he wouldn't go away -- the NFL scares him into retirement by threatening his rep.
Kurt Warner was still getting it popping -- I'm sure that Saint got a extra bonus from the league.
If they wanted Belichick, trust and believe me, they would've framed him the same way they did Brady. No way Brady conspired to deflateballs and Belichick knew nothing. They wouldn't be able to prove it either way. They could've suspended him a year like they did Sean Payton, because if he didnt know, he should've known. Payton was suspended for being ignorant of the situatiom, not because he helped in Bountygate. NFL made it a thing to exonerate Belichick and the rest of the team, including Gost, who refused to hand over his phone too. The NFL got what they had come for.