Well, in the Avalonstar video, he uses Ten Chi Jin, his ninjutsu cooldown resets to 0, and then he uses a successful 3 mudra huton followed by repeated bunnying. The fact that he was able to use a 3 mudra huton suggests that upon casting ten chi jin the mudra combination is cleared in addition to ninjutsu cooldown being reset, otherwise his huton should have failed as a 6 mudra combination (since he also used huton as his ninjutsu 10 seconds prior). His subsequent ninjutsus failed because they registered as 4+ mudra combinations.