Reports show that McKay has stiff competition for a practice squad spot. WR has the most bodies signed than any other position on the Cowboys. Thompson and McKay are unlikely to make the final roster according to 247sports. Plus Thompson is 29... Dallas has numerous young talents that I think they'd rather hold onto.
If you want to bet on a sizable no-namer. I would go with Noah Brown or Cedrick Wilson
So far Gallup is projected as starting the season as WR1, Hurns 2, Beasley 3. After that likely Brown, Wilson. The WR6 is a toss up. I'll go with Lenoir since he was on the practice squad last year and has a year of experience in the system.