The point isn't really how many excuses one can come up with to explain why nothing is ordinary.
It's more about mundane the "extraordinary" becomes when you try to make everything special.
It's perfectly fine to have an aberration from the norm (the gnoll pack leader in this case). Less so when you are making up contrived crap every two steps to justify how nothing matches the standard baseline.
Exactly this, if you want to have a Gnoll leader of some kind who has been marked by the absolute and so has enhanced stats, fine. But don't make his entire pack the exact same as him, or every gnoll in the game the same, because then the leader isn't some kind of special gnoll but rather just another regular gnoll with altered stats like all the others. Same for the goblins, a few marked goblins is fine, but if every single goblin in the game were to be marked and buffed then they aren't really special anymore, they're all just homebrew goblins.