[quote=Expllo]
Mhm.Power wise Kurisa told me that they're randomized, pretty much you're the one who gives them the powers.For example Jewel fought an arrancar swarm little boy thingy which had super strength....So yeah, they're easy to take down but they are large in numbers and display different abilities as Hikari also pointed out 
[/quote]

So a simple way is like saying they are the Pawns in chess. Capable of many things, but don't get that far, yet once in a while.... you get that one pawn that wrecks shit up.