If you’re going to compare Trump vs De Santis with Clay vs Foreman, I would argue that Trump is Clay and De Santis is Foreman. Like Clay, Trump is older, has more experience, and has been in a lot more fights.
I would say it’s more like Liston - Ali. Liston=Trump, Ali=DeSantis. DeSantis hasn’t won anything yet. Foreman was the champion in the Rumble in Jungle. In this political matchup, Trump is the GOP Champion. Liston was the champion. Whether or not DeSantis ‘shocks the world’, as Ali did, remains to be seen.