Assigning a player who has a responsibility of staying with Tebow on runs wont work because it is between the tackles? What are you talking about? If anything, it is easier because their is much less field to cover and other players are in the middle of the field also.
I think you are confused on what best case scenario means. 800/8 isnt a GREAT rushing season for a qb? Off the top of my head, only Vick and Cunningham have run for more than that in a season? What is best case scenario for you then? Then what is "best case" for Brady and Manning who have set TD passing records?
Did you even watch his games this year or just saw the stats? Of the Qb's that put up over 3200 yards, Tebow is a worse passer than all of them.
Besides that, you are still missing the main point. Your projections (optimistic) put him in the Philip Rivers range. Just take Rivers with much less risk. If you grab him before Manning, Brady, Romo, etc. your upside is already priced in.
I take it that you don't know what a spy is. A spy is a line-backer or saftey who "spies" on the QB so that he doesn't scramble on
pass plays. What good does it do to have a LB spying on Tebow, when Tebow is going to run right up the middle? It does no good to have a spy on running plays. That "spy" turns in to a general tackler. Teams will use spies - as I would think they should - but when Tebow runs up the middle, when it is designed, it won't matter. In other words, spies are much more effective on scrambling QBs like Young and McNabb. Running QBs - Tebow is the only one that I remember seeing, with his talents (different, not better than Vick) - won't be stopped by a spy, as the offense is not trying to fool anyone, and there is nothing to spy on. You are missing the point. My projetions, which are conservative, place him in the Rivers range. Rivers doesn't have much potential to do much more than he did this season - he was amazing. Tebow has plenty potential to score more than my projections. 50 yards a game and 0.75 TDs rushing (less than he did) puts him in Mike Vick range, even if we used your silly 162 pasing yards.
Best case scenerio is what he has been doing on the ground, if not more. How likely is that? I don't know. But it can happen, as it did.