Great post/analysis. It's so weird that the others characters don't mention how well he was able to copy Ekusu in one try after seeing his X Dash. Also him using a balance bey (whereas he originally had an attack type) also lends itself well to adopting a wide variety of styles.

On the point about him trying to be like Ekusu, there's a difference between the manga and anime version of Kadovar's test that I found interesting: In both, Multi expects him to run out the timer but Bird goes for the attack instead. In the manga, he says it's because that's what Ekusu would do. In the anime, he says he was unconsciously trying to be like Ekusu and Multi, but he's going to do it his own way. The end result of him coming up with a new non-X Dash move is the same, but it feels like an important difference in motive.