If TB gives up a 1st and a 4th for a guy to play 1 year and then cut him then that owner is gonna fire everyone involved and he should.
Realistic hypothetical scenario in which this turns out to be a one-year rental and no one gets fired:
Revis ends up having more problems with the knee, problems that weren't foreseen by anyone but seem likely to continue You don't fire a GM for a player having health issues, and this "no guaranteed money" contract means they could cut him loose after one year. While TB would still be out the draft picks involved, they'd be off the hook for his ridiculous salary.
Only person who might get fired in that "perfectly reasonable" scenario is the team doctor who gave the green light on Revis' health.