I think that when your 2 QB's developing youngsters, that a veteran presence is a good idea. A mid-round draftee is OK, but really puts question around both Jones and Zappe.
Sure, we could have 6th or 7th rounder or an UDFA for the Practice Squad.
To save the roster spot, perhaps an Assistant QB coach could meet the need for a veteran on the 53.
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BOB needs to focus on the entire offense. He can't be the advisor/consultant sitting next to Jones and discussing the game with him, and helping him see things. And, NO, that person is NOT Zappe.