I'm not sure we ignored the need on the offensive line. The Cowboys just addressed it in a way that most of us didn't think of. Instead of drafting the best available tackle or guard available in the second round to help the pass protection and run blocking, the Cowboys chose to improve the offensive line by drafting a TE with a good combination of blocking/pass catching skills and use a 2 TE set with no FB. A look at the following page shows that our rushing was best running to the middle and worst on the ends.
http://www.footballoutsiders.com/stats/ol.php
With a TE next to each tackle, that should improve our outside running. Then we can also pass off the same formation having 5 eligible receivers in the 2 TE, Single RB formation. So basically by drafting Fosano and moving to 2 TE, we can run it better outside, max protect with both TE's, or send out one TE and leave one TE in to block off the same formation. I almost see this as the offensive version of the 3-4 where the Cowboys now have two additional receivers on each side and defenses don't know which one (if any) will stay in to block and which one will go out for a pass. I also like the match-ups between Witten/Fasano and LB's over Crayton and LB's. I also like Fabini/Petitti/Rookie OT + Witten/Fasano pass-blocking over Fabini, Petitti or a Rookie OT pass-blocking by himself.