I think the fandom has created a myth out of nothing honeslty.
Ryo simply said he likes how Akainu does things, but was introduced didn't giving a fuck about a direct order from Akainu (kicking Fujitora out of MJ) and was presented still didn't giving a fuck about another one (not coming to Wano).
And he cleary has a different objective from Akainu:
He quite clearly Is A LOT more autonomous than what some people believe out of nothing, really.
A black Blade user against the worm would kind of a waste honeslty.