This post hits some key points people conveniently overlook.
Okay, I'll bite.
2011 - Tyron Smith: This pick wasn't as much of a lock as everything makes it out to be. Garrett was going into his first full season and the O-line purge hadn't happened yet. That happened after the draft just before training camp. The problem everybody was stuck on was how the defense had fallen so far in the previous 6-10 season under Wade. It ended up being decent when Garrett took over and went 5-3, but still, everyone was hung up on the defense and how to fix it. Keep in mind we still had Leonard Davis, Marc Colombo, and Andre Gurode on the roster with no word if they were going to be released or re-signed or not; and Doug Free had just turned in a pretty decent first season at LT (it wasn't until the next season that he tanked). Because of all this, we were still coming out of the combine wondering if it would be
JJ Watt or an OT, and most mocks had us taking Gabe Carimi if we went that route. Word was that Garrett really liked Watt, but it all came together when he went out to USC's Pro Day personally and checked out the raw young tackle that had only played the right side. Then Garrett's true intentions came together when he grabbed Tyron Smith, who leaped up boards late. A month later he began to purge the O-line of aging vets, releasing Davis and Colombo on July 28th and Gurode in training camp... and the OL reconstruction process was on.
2012 - Morris Claiborne: After a season of getting torched in the secondary and a having turnstile for an O-line, the two needs for Dallas were pretty clear. However, outside of Matt Kalil who would have been gone by Dallas' pick, there were no blue-chip OL prospects in this draft. Sometimes the draft isn't made up to fall your way. Just because you need to draft OL doesn't mean that the guy exists. Consensus was among fans and media alike that Dallas would go defense, most likely taking Mark Barron with Poe and Brockers in play. When Claiborne dropped, Jerry jumped up to grab who was the widely touted best defensive player in the draft and best corner prospect in a decade. Most fans were happy with that. Oh well. We'll see.
2013 - Travis Frederick: There was no way Dallas was not going to take an O-lineman in this first round. Jerry said that pretty adamantly. They were never going to take Floyd, and don't give me that draft board BS. Just because you aren't going to take a quarterback or kicker or whatever doesn't mean you shouldn't rate him on your board. We were going O-line, no question. When Cooper, Warmack, and Fluker came off the board early, Dallas traded down--with Garrett most likely being upset at the compensation for the trade. They grab Frederick, a shocking reach, but again there was no way they weren't going OL in the first round. Frederick turns out to be a pleasant surprise and probably one of the smartest picks we've made in the last decade or so. (Plus we got TWill out of the deal.)
2014 - Zack Martin: This is probably the lone OL pick that just "fell into our laps" that we didn't target or go for. Martin ends up as our emergency contingency plan. We wanted Barr or Donald.
Everybody wanted Barr or Donald. The glaring need on this team was and is DL. The OL was solid last year so it wasn't exactly a huge need. Barr or Donald didn't happen with the Rams snatching him from our grasp. So we take the consensus best guard in the draft in Martin, which everyone hails as a solid and smart--if not sexy--pick.
So in summary: Tyron was targeted as the starter kit to an OL rebuild. Claiborne was a grab at a can't miss prospect when there were no OL in the draft to take. Frederick was Plan C in an OL or nothing plan that panned out pleasantly. And Martin was the only "draft luck" OL pick when everything else didn't fall our way.
*flies away*