You know, the stupid part is the Yoshi backstory could have been worked into the 2014 film SO EASILY. During the part where April is talkign to sacks, just have him recite the Story of Yoshi and his four sons. Nothing extra to film, just one monologue, ending with 'legends says the five will be reborn someday'. THAT'S IT. No other need to dwell on it, but it was just toooo hard to stick in there!