That's a bit tin foil hat.
IMO Frank put Claire in charge because he could control the team by proxy. That undermined her authority in the team, not that I think she particularly had the authority/expertise to lead it anyway. The succession plan was always Adam Parr but that relationship soured before he could take over.
As for Senna, there's so much unfounded speculation and misinformation, and the Italians were desperate for a conviction too so truths were twisted to fit a narrative. There was no cover up, but if you mean the car being destroyed, that was the right thing to do after forensic analysis so it didn't end up in some creeps morbid collection.