As for the last part about what Kraft said, he actually said the opposite of what you claim he said. He said from now on Bill would have to collaborate. The funny thing about this is that Kraft alluded to Caserio's approach and departure as part of the change being made. Caserio was Belichick's yes man. Meanwhile they lost to Caserio's team last week.
You do realize that after Caserio left that Ziegler and Eliot Wolf took over the scouting. Do you think it was Belichick who took over scouting Mac Jones and Justin Fields. According to a MMQB column by Albert Breer, it was Eliot Wolf. Josh McDaniels was with Wolf doing that evaluation. Mike Reiss the next week corroborated Breer's column that Kraft had made changes and that Belichick would no longer be the one constructing the draft board as he had done in the past. This was from them having several bad drafts in the 5 years prior, so they made changes. Breer said the scouts would report their analysis to a combination of the personnel guys, Belichick and other coaches. You can bet this mostly meant McDaniels. But the personnel guys were Wolf and Ziegler. Prior to that, everything was just the Belichick and Caserio show.
I would say this collaborative approach HELPED the Patriots and Belichick since the team has drafted better the last 4 years (until this year) than it did the prior 5 years.