[Alberta's Child]

I don't think the scenario described here by the author would work. More likely, a "4th QB" like Tebow would be an infrequently-used specialist for situations where a pass/run option play would be used frequently.

I'm thinking of short-yardage scenarios, and perhaps even on two-point conversions.

[Colofornian]

I don't think the scenario described here by the author would work.

Why wouldn't it work?

You have...

...A coach who implemented spread-offenses with QB runs off of them in college (IoW a coach who can operate beyond the NFL "box")...

...A QB who was successful near or within the red zone, leading to 85% of scores on those opportunities? And that was as a mere rookie without an entire pre-season and exhibition season to work up an offense around his skillset.

...And you had a QB who had enough of a red-zone/near red-zone balance (8 TD passes; 6 TD runs) that defenses in those situations need to respect.