And their fossils all exhibit stasis.
What are the odds that all of the discovered fossils to date exhibit stasis in species?
So you say, but one fossil of a species cannot tell you anything about "stasis".
Indeed, a whole herd of Brontosaurs drown in a flood, preserved perfectly, cannot tell you anything about "stasis", since they all died at the same time.
What might demonstrate "stasis" is the same exact species found in strata millions of years apart.
But because we are looking at rock-fossils, there is no possible way to say if the species didn't change genetically in those millions of years.
So I'll cite again the example of zebras -- a dozen breeds and sub-species within three species and two genera.
Their fossil bones themselves might suggest "stasis", but the reality is those three separate species don't normally interbreed, and the two genera can't.
So that's not "stasis", that's just normal evolution, doing it's "thing" over the course of millions of years.