Could it be that it really doesn't? That it's just wishful thinking by people who want it to look that way so that they can eliminate God from the equation?
It seems the easiest explanation to me for why we only find rather small and mostly marsupial mammals in strata laid down during the age of the dinosaurs.
And that proves what, exactly? Besides the fact that it appears that marsupial type animals existed in proximity to dinosaurs?
Ah the “scientists hate God” delusion.
And it is evidence that only marsupial mammals lived that long ago, and placental mammals were a more recent development that edged out marsupials everywhere except Australia.
Just as Antarctica is evidence that when it drifted too far south, the animals that inhabited the Earth were far different than the ones that inhabit it today.