Since Vertucci is a student of Weiss's offensive philosphy, we can expect that Verducci will favor more of a dual threat quarterback (the reason why Adazio bailed on Tim Boyle). Having said that if Sherriff and even Davis present a significant edge, dual threat wise, as advertised, don't be surprised if Verducci and staff lean more towards the most effective dual threat rather than a drop backPro Style QB. I also expect seeing Dario Highsmith on the QB depth chart as well.
As you can see from the link below, Weiss has changed and sees how the college game is more condusive to a qb who can run with the ball.
http://www.nfl.com/news/story/0ap2000000366364/article/charlie-weis-thinks-dropback-quarterbacks-have-been-exposed
It seems intuitive that a mobile quarterback would be more desirable in the College game, but I'm not sure a true dual-threat QB is absolutely necessary.
Due to how sacks are recorded in college (negative rushing yards as opposed to passing yards) it is tough to get a true read on the mobility of any given QB unless you watched a crap ton of college football, and none of us here are Mel Kiper.
Be that as it may, prior to Cozart (277 positive yards in 13 games over two years), Weis did not have a QB with positive rushing yards since Brady Quinn.
2013. Jake Heaps (-167 on 40 attempts)
2012. Danyne Crist (-66 /27)
2011. John Brantley (-120 /25)
2009. Jimmy Clausen (-95/59)
2008. Jimmy Clausen (-73/54)
2007a. Jimmy Clausen (-187/62)
2007b. Evan Sharpley (-95/38)
2006 Brady Quinn (Positive 71 yards on 82 attempts)
2005 Brady Quinn (Positive 90 yards on 70 attempts)
That said, pocket mobility and awareness are absolutely at a premium at both levels of today's game, but the ability to pull a Johnny Manziel or Seneca Wallace is more luck on a broken play than anything else. Don't get me wrong if either Sherriffs or Davis can become the next Russell Wilson, I'm all for it, but I'm not about to hold my breath waiting for it to happen.