@bold1
Yes they are.
@bold2
Shadow Possession is not a bloodline limit, neither are choji, ino, or kibas clan abilities. They are hidden techniques within those specific clans but they are learnable. If you didn't know this then you need to go reread part 1.
@bold3
The only bloodline limits in the leaf are Wood Style, Sharingan, and Byakugan. Not even Shino bugs are a bloodline ability, they aren't born with it, they get them from an outside source.
@Rest
Except techniques like shadow clones and the others I mentioned are yin and yang. Yamato explained it to Naruto during Rasrnshuriken training.