They drafted Fredericks of Hollywood or did Travis Frederick get a new nickname?
You can't compare the draft to a wedding. No team except the on with the #1 overall pick can make an exact plan for the draft. Going into the draft determined to get specific players or positions is the worst possible draft strategy. The Cowboys did that in the past like when the were determined to get a DE and drafted Shante Carver.
The fact that they drafted 3 OLinemen in the first means that they were planning to draft OL high at some point. They were probably almost certain that Tyron would be the pick that year, but with Martin and Fred they had to wait. If Aaron Donald had fallen, maybe they would have drafted him.
They tried to trade for an additional 3rd year in 2014 to get OG Trai Turner (One of my favorite players in that draft) who has been a very good player.
Turner was named to Sports Illustrated All-Rookie Team. Through 618 snaps in the season, Turner did not allow a single sack.
2015 NFL season
Turner picked up where he left off from his strong rookie season. Through the first three games, he did not allow a sack and surrendered just 3 QB disruptions. Turner had not allowed a sack for the past 627 snaps, the 3rd longest streak in the NFL at Left Guard.[24] Through 6 games, Turner allowed just 8 hurries as a pass protector and as a run blocker, he rated as PFF's 4th best run blocker in the NFL. Further, through 9 weeks, Turner ranked as PFF's 4th best guard in the NFL.[26] Turner was selected for his first career Pro Bowl during the season. Turner could not play in the Pro Bowl due to the Panthers appearance in Super Bowl 50. For the season, Turner allowed just one sack all season despite a passing attack that held the ball longer than most and targeted downfield often. Further, Turner was charged with only 2.5 blown blocks in 1,074 snaps played. The only full-time guard with a better rate of blown blocks per snap was Dallas' Zack Martin.[According to PFF, Turner also had the seventh-highest pass-blocking efficiency among guards.[28] On September 6, 2016, Turner became the first solo offensive lineman since Nate Newton to appear on the cover of Sports Illustrated.
In addition to the draft, they went all-in to lure UDFA La'el Collins to sign on and had previously given Ron Leary a 200K plus guarantee to sign as a UDFA.
They hired Bill Callahan in 2012 to install the Zone Blocking Scheme. This was an interesting move for an existing Head Coach. Normally those types of changes happen when a new Head Coach comes to a team.
Conclusion: Yes, they indeed "planned" to a have a top OLine.