Was that the 2008 championship team? Mason won that game 67-56...Thomas had 18 and 17 in that game (still salty he didn't win CAA POY that year).
To be fair, Paulsen has done slightly better against Dayton than he has against some of the other top tier teams. Davidson and St. Bonaventure are two he's done just awful against. I think he's only won something like 1 game against URI, too, maybe 2.
To your broader point though, Mason hasn't been able to nab any consistently dominant players since joining the A-10. No guys that are gonna make 1st or 2nd team all conference for 2-3 years of their career. Maybe one of the current freshman will develop into that. Who knows?