Is kinda interesting how are depicted the members of the Bloodline Claws. Doesnt mean they all are super strong but they all are super skilled with their weapons being able to punch above their level
Kamui was basically an anomaly by being strong, skilled AND with huge potential to the point he was given his graduation gift aka his spear just by fighting a bit against Gilzea.
Nebulin has even more potential than Kamui dragon wise, but not only is unsuited at combat but also his dragon skills are more defensive/support oriented. To put on perspective Kamui is basically a min maxed combat build, while Nebulin have more even stat points than Kamui but the allocation is not optimized, with an all over the place build