I think there is some good to be said about not rushing to fire your head coach.
Jerry is probably doing it for a strange reason however.
Could be that Jerry actually likes Garrett and maybe wants to keep him in the organization somehow. It would be similar to if the Saints ever had Drew Brees as head coach. How would you "fire" Drew Brees. Garrett's been there a long time.
It's tough with Garrett since he's definitely young enough to still want to coach.
The other reason to stall is there simply may not be a reason to hurry. Some of the Cowboys best candidates might still be coaching for a few more weeks.
The other item would be $$$. Don't know what Garrett's contract has, but not firing and just letting it expire whenever might save Jerrah some $$$. I wouldn't think it's much at this point.