I almost wonder if they were leaning towards Heaps but his injury has them in a wait-and-see.
Why would they rest an arm if they weren't planning on using it labor day? Think about it.
So...if he has a sore arm and they weren't planning on using him on Labor Day, they wouldn't rest it? I don't see the logic there at all.
Depends on whether they feel he has the job locked.
Heaps injury seems to be something that he could have played through. If the coaches still were unsure of the starter, I'm sure they would have had him play through the soreness.
Also, this move gave Kaaya more practice running the offense with the ones. Kaaya needs all the experience he can get.
I think the coaches did this so that in case he's needed labor day he would have gotten the sufficient reps that they would have been comfortable with.