Later, in 1951, Sternberg recognized P. grandis as a possible synonym of Troodon, and speculated that since Stenonychosaurus had a "very peculiar pes" and Troodon "equally unusual teeth", they may be closely related.
Kasnije je, 1951. godine, Sternberg spekulirao da su, s obzirom da je Stenonychosaurus imao "vrlo neobično stopalo", a Troodon "jednako neobične zube", možda bili u bliskom srodstvu.