To quote one scientist:
It’s as if millions of species just suddenly appeared!
Yeah, they did.
Please provide a source for your quotation.
And then there’s that pesky Survival Of The Fittest premise: How, exactly, is a lizard {destined to be a bird in a few hundred million years} which is dragging around its stubby “pre-wings” which are no damn good for flying yet but, oh, so cumbersome when trying to slither through cracks in rocks to ESCAPE ITS NATURAL PREDATORS, supposed to be more fit to survive than its non-mutant brothers & sisters?