I see the man's point. He is not saying this can't be done but his point is the odds are against it. Was not Tom Brady a Hail Mary who happened to work?
18% is all you need to figure this out Cousins for a pick that will have a productive long term NFL career. That is the success rate of an average entire NFL Draft from 1-7.12 divided by 18%=2.16 players , say three who will be good players for the Pats by 2013 if we have an average Draft. 4-5 if we hit a home run. 12? ....nope.
DW Toys
I'm not sure where the 18% comes from, but even if we assume it's true, BB's definitely ahead of that. If we discount last year's solid draft because it's still too early to judge, I count 26 contributors out of 77 picks, good for 33%, or almost double that 18% you mentioned. And I'm not even counting guys like Wilhite or Wheatley or Crable, who could one day become contributors.
Part of the pessimism in the late-round picks may be because we hit on 0 of 14 picks after the 4th round from 2006 to 2008. But that wasn't just the late-rounds; these were some of the worst drafts ever under BB, from top to bottom.
Still, if we look at those "hail mary" picks from the 5th round on since BB took over, 6 out of 38 picks were contributors, a very respectable 16%. Again, this doesn't include 2009, which featured major contributors Ingram and Edelman, as well as a guy who filled in admirably in Myron Pryor. With 7 picks, the chances of finding at least one solid contributor are very high here.
Tom Brady jumps out obviously. But Matt Cassel, Dan Koppen, TBC, David Givens, and Patrick Pass were all solid contributors picked late in the draft.
I know you're an advocate of trading those picks for proven players, and I certainly agree that there is nothing guaranteed with the draft. But there's nothing guaranteed about free agency or trades either. Ask Washington about Albert Haynesworth, or BB about Adalius.
As for trades, they can be a bit difficult to track and assess, but some of the big deals that stand out over the past year are the Jay Cutler deal, the Cassel/Vrabel deal, Greg Lewis/Alex Smith/Derrick Burgess to the Pats (ouch), Lito Sheppard/Braylon Edwards to the Jets, Jason Peters and Ellis Hobbs to the Eagles, and Richard Seymour to the Raiders. While it's too early to judge many of these deals, I don't think you could claim any of those were decisive wins for the team trading picks. Maybe the Peters deal, though I'm not a fan of his and they really overpaid.
I'm certainly open to trading picks for proven commodities, but I also accept there are no guarantees there either. If you factor not only the trade compensation, but also the contract extensions demanded by many of these players with no guarantee they'll work out, and I'm okay with not burning those picks on some of the players that were available.
Bottom line is I'd be ecstatic if we could connect on 16% of hail mary attempts in an actual game. Those last 7 picks in the draft may not yield multiple pro bowlers, but they aren't as worthless as the OP claims either.