And until these young WR's get acclimated to college football, we arent going to be throwing it any more than necessary to keep defenses honest.
Lee will most likely be the solid #1 exiting practice. But, what you said is why I actually think we see Relf more than most are anticipating. We just won't have the experienced WRs throw the ball to. We do, however, have a pretty nice stable of RB's. I don't know if it would be accurate to say we will be a "run first" team. But, I'd be willing to say we will be far better executing the run plays versus pass plays in Year 1. If we have a fall back, it will be a running play. I see Relf as far better, reliable, more durable runner than Tyson.
From the little I understand about Mullen's offense (thank you, smartfootball.blogspot.com), a mobile QB is preferred so that the offense is in a +1 position on personnel that can block or run. Tyson can scramble, but I'm not so sure the little guy can block or run effectively (especially over time - wee-man bones break). Relf, just by the size of him, can be more useful in running plays (option, blocking, etc.) than would Tyson.
Plus, Relf can more likely force the defense to devote a guy on to have to both cover the QB on the option/run play and have to drop back quickly to cover in pass situations. That's the huge win area of the spread option offense with a dual threat QB.
Of course, the downside to Relf is that he tends not be able to hit the broad side of a barn - so the defense may not have to respect him as a dual threat.
Tyson = safe play with limited capabilities on offense.
Relf = high risk/high return. Potential dual-threat.
The fan in me, who has nothing to lose, says put in Relf and see what happens. But, I don't make my living by making personnel decisions. It will be interesting to see if they go the risky route or the safe route while easing everyone into the system.