well for decades it usually was one wendigo at a time. In chaos war, Somon manipulated the spell and turned people even tjough they didn't eat flesh, get beaten, etc. The hulk issues started the bite, scratch wendigo infection and guess it stuck. I prefer one at a time rather then multiple ones at once as it turns into the ninja effect as they become less of a threat in larger numbers even though it should be the opposite.
I don't think the chaos king had anything to do with the hulk issues or you mean Tanaraq?