Okay, so I'm about to beat Chris Chapter 3, and I am marking my prediction for the spoiler (I only have Geddoe 3 left to do after this.)

(SPOILER)I already know Geddoe knew the Flame Champion from his scenes at the end of his chapter, and he knows that one dude from Hugo's village (I forget his name). I Think he was the third guy with Flame Champion and Geddoe. The most recent villagers revealed Chris's Father is Still alive, and had fought along side the Flame Champion, and lives due to the True Water Rune. The guy from Hugo's Village is clearly Karayan, so I don't believe it would be him (Though He likely also possess a True Rune considering he's still alive.) So, the holder of the True Water Rune and Chris's Father is really Geddoe!

See if I"m right.