I like Warren, but as i have said in another post.... TEs that are worth the 4th overall pick are SUPER rare. You're talking Gonzo, Gronk, Kelce, Shape, Winslow.... Game breakers.
Do this thought experiment. How many TEs exist that you would trade the 4th overall pick for. Now how many WRs?
Of the top 30 offensive weapons last year, how many were TEs? How many were WRs? Is the 5th TE worth the 5th best WR? The 10th? The 15th? You need to get to the very top of the pecking order for TEs for them to have a huge impact.
The 10th best TE in the league is Hunter Henry... how much is having him REALLY worth? The difference between the 10th and 5th guy form a TE perspective is huge... for the 5th to the 1st is another pretty huge leap most years. Let's say Warren turns into the 10th best TE in the league... that makes him Hunter Henry. Not near good enough. He needs to be top 3... that is a guy consistently hitting or around 1000 yards. Do you trust he can do it? I don't.