Ichigo's dad is a shinigami (captain class atleast), his whole family is special, "duh". I mean who else sees ghosts since they can remember. Also we haven't seen to what degree the hybrids can use their newly acquired zanpatous, so all of this is speculation. From the get go it was stressed throughout the series that Ichigo is not normal. There are others ofcourse, Toshiro for one, he joined after Rukia and renji but still became a captain before them ( still kinda weak though compared to the other that we have seen).

Also it was said that they would need 10 hybrids to fully destroy Soul Society; Azien has 12, so it can be said that there powers can't be all that much of a difference. But then again you never know.

Lets just wait and see what happens next, since the fillers just ended and the anime is now about to get back on track(for the most part from what i am reading). Don't sweat the small stuff. Atleast lets not speculate too much. Sit back relax and enjoy.