It's very, very, very rare though. The hit rate is extremely slim.
I imagine we would all concede that there are other 'overlooked players' since 2000 apart from Mitchell, Stokes and Taylor who have proved to be very capable AFL players once they eventually made their way onto a list.
But if we simply started with them as a sample set, that would be three players out of well over 1,000 drafted by all clubs during that same period.
On that basis, I think your 'very, very, very rare' is pretty much right on the money.