While I argee that his rejuvenation trick is just a magical art he somehow learned or acquired on his own, you are overlooking another detail.shouki wrote:With regards to Souhaku's power and any possible Kago family power, I don't remember there being any direct indication of the Kago family having inherited special powers. But maybe I'm forgetting something. If they do, it could be that Souhaku has a "mutant" strain. Otherwise, he's probably like Senhime - a very rare (random?) innate ability out of the blue. If Souichirou doesn't have the same power naturally, then it's probably an uninheritable power.
Kago family is the 6th Red Feather family (after Natsume, Nagi, Shoujou, Kabane and Hotaru), thus they (or Souhaku personally, at least) must possess some sort of an 8th Dragon Gate.
Senhime is either a descendant of the True Warrior, or perhaps a blood relative of the Takayanagi Clan. Which could actually be the same thing, since all the Flying Phoenix families are descended from the True Warrior in some way. She could also be completely unrelated to the 12 families and have the Amaterasu Gate for whatever random reason, but I think Oh! Great would try to tie her into the big picture somewhere.
And if Reiki is blocking Kago's power, then it's yet another proof that this rejuvenation trick is NOT a Dragon Gate, since we've seen a Dragon Gate used in the presence of activated Reiki before (Maya vs. Tetsuhito being the latest example). Nothing was blocked then, so if Souhaku's power was in fact blocked by the sword, it must be something other than a Dragon Gate.