Okay, so... the episode this week was titled "The Search for Utamu", but as it turns out, it seems it was a name change from "Fuli Speeds Ahead" after all, and "Bunga the Brave" was simply mistakenly labelled in that youtube promo, it's nonexistent.
So in the end they were all one and the same episode all along I'm sorry for the confusion, guys. At least the mystery is solved now.