In response to PatsEng's comment:
I think he gets cut but not because of Garp played. To me that has nothing to do with my reasoning why he'd get cut.
To me, if he stays he takes up a spot so he has to be worth that spot. To be worth that spot he'd have to give at least be a guy that might not win you games but also not lose you games if he replaces Brady. I thought Hoyer was that type of guy and Cassel was that type of guy. To me Mallett isn't that type of guy. If Brady goes down and Mallett takes over it's end of season even with a top 5 D. So, in my eyes he isn't worth the extra roster spot right now.
Now I know that what Garp does/did has no bearing (which to me it doesn't) but if Garp does the same thing in the next two games it makes the decision easier.
Trust me, I'm an engineer!
+1 my thoughts exactly