About Yetis...

So, one of the things I was most stricken by when Willump's new look was revealed was how close he looked to what I had envisioned as the monster Galio fights in his color story. Obviously I was thinking something a lot bigger than Willump seems to be, but his appearance was influenced by Nunu's perception of him after all. Their bio mentions that the rest of the yetis "[descended] into savagery," but doesn't say if they all died out, so could it be that the monster Galio fought was a yeti that had been captured and made into a warbeast?