Yeah I have no issue with what you said, because on paper, you're right, I was a little doubtful myself when I heard that said because the cover strength is so different. Code X is stronger than I expected.
The Idol was said to be a Marvel S replacement too, but I'm not seeing that as much, shapes are different. Idol is super round, Marvel S was a bit more Haywire-ish, more angular.
Bowling isn't done on a sheet of paper, and this is one of those cases where the numbers don't quite add up.