For the 1st bit there. It doesn't exactly put to bed him being inferior as that wasn't what was said in the first place. When we, or I, said Michael may not get the full Power Trait, it's that it wouldn't fully develop. As I've said, it wasn't like Michael wouldn't be powerful, he's still an Apostle spawn after all. It's that he wouldn't get the full Power trait because of his compatibility possibly being low. That's what I was referring to with those comments.
The real important thing about that scene was the ramifications about one of them missing during that whole thing. Also the fact that Nyx expected us to see it before sending us out there. Which is what made that scene sus for me. Like she might know we're also a spawn of one as well and is trying to bait them to react since another one is present. At least that's what I think about it.
Well it kinda depends on what you consider as "full trait". MC for example has the full body trait. Whatever Ella can do, he can also do. The difference is that MC has to do it in a more instinctual manner while Ella has way better control right of the bat. However they both can change molecular structure so the "depth" of their ability is pretty much the same.
In Michael's case, the abilities we can observe from the 2nd are
1) Matter to energy conversion (absorbed the Leigong)
2) Energy transformation (got lightning, outputted some form or radiation)
3) Radiation based attacks
4) The glow that turned night into day.
5) Energy to matter conversion (probably what happened when it created it's arms)
Michael could already do the first 4
and during his evolution he also did the 5th, by increasing the size of his muscles. So I don't think there is any indication he didn't get the full trait.
He also did well against Tif, who is supposed to have compatibility with the 8th so he doesn't seem to lack for power in comparison.
As for
Nyx, that's a smart connection. Nyx is savvy and tricksy, although personally I didn't get the same vibe, due to how she dismissed it once MC answered negatively. The funny part is that eventually MC noticed it and Nyx probably missed it. The way the narration goes, it's also possible that MC noticed a presense in Tiffany that Nyx missed, but Michael's was stronger.