It wasnt really about characters' "power levels" or at least not from me anyway. Its about the game play mechanics and how the characters powers are portrayed in the game.
If Cervantes were a guest from a different game, how he plays and what he does would obviously be very different depending on the game he comes from. Bayonetta, DMC and Nier are all similar games in that the combat is similar. If he were the main, playable character in those games, you would expect his abilities to have greater focus on ranged attacks, his flight and teleports. Far less so on any basic sword attacks because from the ground up, he would need to be designed to clear out clusters of enemies in quick succession. So the frequency and rate of his attacks would obviously need to accomodate that. In that case i would suspect GeoDeRay would be the primary means of movement just to move from spot to spot.
With action games that are not like that, in other words has far less opponents to engage at a time, there would be a far greater emphasis placed on basic, single strikes and slashes. Ranged attacks, flight and teleports would be something far less common and probably restricted to something like a meter or limited uses.
These two characters are not the same thing at all. They are entirely different because when someone plays the game, they spend their time doing very different things. One of them can be faithfully ported into Soulcalibur and the other can not. Whether they can or cant be accurately ported depends on the game they are moving to and what kind of combat mechanics it has.
This is a very clear and obvious fact for anyone that cares to give it some thought. Maybe people wont agree that its necessarilly important to faithfully port a character accurately but saying i'm "making shit up" is very stupid. I'm aware you didnt say that, i'm just using this post to address that.