I do think he's a good person, and if he is, he's very likely to be Denjiro
BUT I am hoping that he's a bad enemy. Because he looks like a very interesting character to have as an enemy.
By the way, there is a valid argument I see against him being Denjiro in that he organized the executio of Yasui, whom all the scabbard seem to feel great debt towards him.
However, to be fair, I can also see Yasui himself telling him that he needs to do this for the cause. Because Yasui lied about himself being the witching hour boy. So, Yasui intended to be captured and sacrifice himself in order to make Orochi look like a fool, who imprisoned people for nothing bcause of the leaked info about "crecent moon mark" on the ankle. So, even though, the argument of Kyoshiro letting Yasui die is a very strong argument, it's very possible that there was a secret encounter between Yasui and Kyoshiro, in which Yasui told him that he wants to do it, he needs to, it's the only thing he can do now as an "old man". Since he doesn't have his old strength, so, maybe he convinced Denjiro about the sacrifice, and Denjiro might be someone who have the HIGHEST dedication to the cause considering how much he idolized Oden. So, it's possible he accepted Yasui's plan.
But yeah, generally, I WISH that Kyoshiro is an enemy, and not an ally. But I'm very doubtful.
hell, him staying back in the capital during the fire festival is only more fuel added to him joining the forces on their attack.