Unless you mean right at the end, no. After his powerup Malgus owned Leneer, who he was only equal with previously.
He was already a bit above Leneer in their first duel, and while he increased in power to the point where he was able to overwhelm her, that was far from ownage. Intrepid also has argued that boost was only temporary.
Emperor Malgus is far above Zallow and would stomp the shit out of him.
He has no such skill feats to constitute this.