I can't help but feel like most of the elements involved here are much more functional, which I feel shouldn't be patentable.
If the argument is that the daisychaining is in the body, it feels a bit like... d'uh? Where else would it go? And the placement is also... d'uh? That's the place not occupied by the fan.
I mean making fans daisy-chain through the body is, as a high level concept, novel. Moves away from having extra cables, etc.
But while the solution is on a high level novel, imo, I think the more specific you get the less novel it becomes, and the more it gets eaten by the functional requirements of it remaining a pretty standard fan design.