@Bold: It was never hinted it wasn't.
@Underlined: Exactly. Maybe. Pure speculation.
It's even more pure speculation that Bee can replicate Ay's jutsu with just brute strenght, when a jutsu is more than that.
Pure speculation is the fact that Bee can use ligher bomb.
I'm not saying Bee can use Liger Bomb, as that is also pure speculation. But we also can't speculate about what exactly Liger Bomb is unless maybe there's something in the DB about it.
Bee is even stronger than Ay. If he can't replicate ligher bomb it's because it's more than brute strenght. Things like technique (wrestling type) is also involved. Chakra release is speculation yes i admit it, but i used it as an example of something else than brute strenght.