Estlor
Explorer
To the best of my knowledge, He-Man never displayed that power, no. I believe She-Ra did at one point. So you could look at it one of two ways. You could say "Power of Greyskull" and "Honor of Greyskull" would be different oaths with different associated powers, or you could just lump them together in your brain to solve the cognitive dissonance even if Etheria and the Horde never popped up as setting material.Yes, this has potential but I don't recall He-Man healing anyone.
(The real reason He-Man never healed anyone was because he could solve all his problems in the '80s by throwing something or someone.)