Bam can pretty much finish off regulars of his level with simple shinsoo attacks. The attacks he used against jahad are for stronger opponents. And even if those normal shinsoo attacks don't work on Rachel as she has something protecting her, Bam doesn't know she has that.
even if others did get a powerup they are still no match for hoaqin except bam. And as for karaka wanting to kill bam, it is not only because bam's getting in the way of white's resurrection but because he's afraid bam might kill him in the future since bam's growth potential is a lot better...
It is inside him but he is not using it. Blue demon also mentioned a thorn wrapped in bandages was put inside and complained why bam keeps putting things in. If it was just in his pocket, blue demon wont even complain and I doubt the thorn being so huge would fit the pocket.
I think the black aura around him is his unique shinsoo quality suggesting his name.25th Bam also meaning night in Korea, so It can be indicated as darkness.
It does make him better. Enne Zahard was considered a genius never seen before for a regular and the twins are also surely strong as they lead the main ha family but maybe not as strong as enne. So bam can be considered the same being the child between 2 irregulars. Obviously his main powers...
Bam's potential and rate of development is obviously way better than zahard. Don't forget both his parents are irregulars an he himself is an irregular.
bam sure has talent but he's a monster among monsters since he's the child of 2 irregulars who are of the same level as jahad and ten family leaders and he himself being an irregular.
I know that bam is physical strength is very weak without shinsoo. What i'm saying is how we cannot judge whether bam has average or exceptional talent in physical strength since we never saw him train in that aspect..