Uh, average reading comprehension will tell you that the first line of my post says the Cowboys are NOT set at DE.
Just to entertain the discussion, however, there is no way to know what Dallas has at defensive end until we see them play as a unit. This coaching staff, especially Marinelli, will be the ones to determine what our needs truly are. To take it a step further, and they should tell you just how "in the know" the pundits really are, drafting Bosa at number four is not going to improve the pass rush. If Dallas is really into him on improving the rush further then they need to look elsewhere in the draft, such as Shaq Lawson.
That's not saying Bosa is not going to be a fine defensive end in the league. He's just not going to be a "sack master". He may play the run better than anybody else out there, and there is definitely a need for that. But, by your own words, Dallas is looking to turn up the pressure on the quarterback Taking Bosa at number 4 doesn't help that.
I stand by my comment in the first post… The best way for Dallas to "turn up the heat" is at the defense of tackle position. Look at all of Marinelli's defenses over the course of his career. He had some pretty good DEs, but his 3-techs (Warren Sapp) is what made the defense go.