Dobbins is not the only ones. Several NY groups believe this as well.

NY Wild:

The red fox is under pressure from the influx of Coyotes into New York State. Coyotes kill the foxes when the two territories overlap.

The apparent increase in red fox populations near human habitation may be linked to the growth of the coyote population in New York State. The smaller animal can survive quite well among humans due to its secretive behavior.

Tons more for the North east, inlcuding the Ontario, and Maine, and New Foundland government sites.

All state that red fox are the ones pushed out by coyotes. Since coyotes roam a larger range, you would have to have a solid pack of them in the area to begin the competititve problems.

But like I said, the point still stands, gray's will be less likely to move out of coyote territory compared to a red fox for many reasons.