this is just mere speculation... maybe their plan is to put Devlin on the PS and they don't want teams to get a serious look at him.
I don't think that's it. They don't have enough time to truly evaluate 3 QB'S.
They can only look at Moore and Henne. You throw a 3rd QB into the mix then you definitely don't have enough time to truly evalute each QB. Moore is getting the short end of the stick here really. However, all Henne has to do is play like he did last night and Miami will be ok