I never blame a young player for wanting to play more. I'd be more concerned if they were content being a backup player. I've always believed the Cowboys were foolish for wasting three second round picks on tightends in 2006, 2008, and 2013. Fasano and Bennett had respectable careers after leaving the Cowboys; Escobar, not so much. But can you imagine how unhappy Travis Kelce would have been playing behind Witten in Dallas, if they'd picked him instead of Escobar in 2013?
Bennett was a talented Tight End. It's understandable that he was unhappy with the opportunities he got in Dallas. But Dallas Cowboys fans can hardly complain about having a Hall-of-Fame bound tightend keeping the 1st string job. In my understanding, this is why "best available" player is not always a good draft strategy. When you are already loaded at a position, it is wasteful to spend high picks on the same position. I was much, much happier when the Cowboys drafted John Phillips in 2009, Geoff Swaim in 2015, and Rico Gathers in 2016. Phillips had a 10 year NFL career, Swaim is in his 5th season, and Gathers lasted 3 seasons. Those were 6th and 7th round picks, which is a good use for career backup players.