Alexander, although being a Klingon by birth, was weak, having been raised by his only half Klingon mother among humans rather than Klingons. Whereas Jake, although human, was raised with a mind to take care of himself because of his absent father.
I believe Jake could take him. Hell, I believe Nog could take him.
Dog Sisko is barely there, he’s too caught up in running a station and looking at a baseball to be a father.