It’s tough to say how strong Jacob really is, but it’s certain that he far outstrips either brother (at smol scale). They wouldn’t be able to lift up a vase like he did during his bumpy first encounter with Dean, that’s for sure.

He would definitely be up for testing that upper limit, though, so if Sherlock makes sure not to look too much like a scientist about it, Jacob would be game. He could bench BC Dean for a warm up, though, which would probably offend so much. How dare, kid.