Untouchable, I agree. Maybe the theory of Rex being an excellent coach will enable the defense to flourish more than they have over the last couple of years. I really like Warmack because he fits a need at Guard and the learning curve for him to make an immediate impact is like 0. You can plug and play him day 1. You can add another guard through FA or a undrafted rookie to fill out the roster and sign Slauson as a backup/reserve player. A unit of Brick, Warmack, Mangold, free agent and Howard could be very formidable. And I just don't see another player in the top 20 making a dramatic impact. So Warmack makes sense.
I really like what I see of Vaccaro though.