I agree that Dak will be better without Dez because as it has been said many times, Dak is a QB whose best throws are done when throwing to a spot. Sure he can improvise on the run, but I think he will be much better with dependable route runners. Dez was never a dependable route runner. Troy Aikman was at his best when he could throw to a spot. He would have been on Dez's case for not running crisp, dependable routes.
On the route running thing, one comment about being "crisp" in routes. In the NFL, if you want to be a great route runner, you MUST be precise. Making the cut at exactly the right angle with speed and knowing exactly when to look for the ball. It takes great discipline, practice and timing. Jerry Rice, Michael Irvin, Marvin Harrison, Steve Largent, and Fred Bilitnikoff make a short list of GREAT HOF receivers that made their chops by being great at running routes. Route running is not overrated!
During his younger days, Dez was able to muscle his way through press coverage and though he didnt have great speed, his athleticism made up for it. But his physical style has taken a major toll on his body and it shows in his game. He is no longer a dominant receiver. Good, yes. Great- no. Dez will go down as one of the top 5-7 receivers in Cowboys history and he deserves respect for that. But this team is not going miss him that much if at all.