I disagree. Bray has been in the practices and running the offense in training camps for three years. He has studied, and knows, the vast playbook of Reid. He has done this for a few years. The rest of the offensive players have done the same thing and deserve to have a backup QB who can use all of those players and the entire playbook. Mahomes needs at least a year to be able to utilize all of his players and to know what the hell is going on out there, reading pro defenses, etc. Using him too soon could destroy his confidence and make him tentative. A lot of promising QB's have been permanently ruined that way. We have too much of an investment in him. Bray should be the backup. No FA QB knows Reid's system like Bray.
Bray knowing the system and the coaches knowing him and what he is capable of is key in this. I'm guessing they are thinking that Bray being in and knowing the system and knowing what he is capable of is better than a FA QB with experience that will not know the system very well. With the available FA QBs id rather give Bray a shot and see what he can do if necessary.
Chase Daniel was not an experienced QB when he came here and he was fine as a backup. To me the way they are doing this is an old school approach to it and are trying to develop everything in house.