Eggy could barely beat him with 2 or 3 seals opened
Omi (as a spirit) could barely beat him with 1 seal opened
Ove and Essy would lose even with no seals opened
EdgyHead (with the Ruby) could beat him with all seals opened, at a mid difficulty.
Starved Eggyhead would lose to him roughly around the same time Collecter did.
Egg-alomaniac could just barely beat him with all the seals opened.