What numbers? I don't disagree with drafting arm talent, but if you use that strategy, you will miss a lot, and by the time you get that qb you will likely be talent deprived. You may not even know he's the guy because it's very, very rare for any qb to shine without talent around him. Consequently you'll have to build around him at that point and by the time you get the pieces in place he will be due for a big contract. Then you have to decipher whether or not he's actually worth it.
It's a much, much better strategy to build up your lines and wait for a qb you believe in while simultaneously taking mid round shots at guys and developing.