I'm not generally high on the BPA thing. If you don't have someone you want at a position you need at your spot, you should trade back. I have seen countless times where teams do BPA and just get overloaded at a position and waste the pick.
But man, that pick was such a no brainer it wasn't funny. There is a good chance in a year that he will be Dallas' best receiver. He is going to make everyone look better. Dak, Gallup, Cooper, Zeke and even the line because he is such a weapon. Having an offense that good will actually make the defense look better. Playing with a lead is much easier than playing from behind.
I believe Jerry when he says that he was rated #6 on their board. A lot of people had him top 10.
As another note, virtually every good defender had come off the board. Whomever was taken would have been a big reach. If Dallas took Chaisson there, I just have a feeling he would have been another in a long line of first round DE busts taken for need.
I'm really excited for next year right now. The offensive skilled positions are possibly the most stacked I have ever seen them.