That's an interesting consideration - didn't think of that - if Kurono sees Sutezou's true form, then he might make the connection like you've proposedYou know, considering that the kicker to Kurono's character development was being the only survivor of the temple mission and that Sutezou is basically the same alien that killed Katou and Kishimoto, I wonder how Kurono will react about that.
What I did consider was that the espers have the abillity to "see through" the body, and so, they could by accident find out, even if Sutezou remains in his human form. However, if they stick with Reika, they are more likely to end up encountering Kurono