That said, Plagueis underestimated Palpatine, leading to his own demise at the hands of his apprentice who surpassed his master's wisdom. Darth Sidious' betrayal marked the passing of the torch ...

While The Acolyte did in fact have a “last minute” big cameo in the form of Master Yoda ... is referring to is meant to be Palpatine, Darth Sidious. But before Sidious, the idea appears ...