I'm going to put all of it out there and not just cherry pick the flashy parts because I think they help my case.
Donald had 9 sacks, Collins what? 5.5? As a rookie after missing most of his rookie training camp.
And he also somehow contributed to the league's #1 run defense.
I've never gotten an answer on how Donald and the Rams did there.
But all of those numbers matter for a defensive tackle, and a defense. Not just the flashy ones.
And if I'm not getting 20-times the production, I'm not paying 20-times the cost.
The pertinent numbers, Aaron Donald had more than twice the total tackles and almost twice the number of sacks. He did so even with consistent double, sometimes triple, teamed.
That Donald's team ranked lower in team defense against the run is only tangentially related to our discussion. That you say you're not going to cherry pick but throw this stat as the most integral to DT production is nonsensical especially because not many teams ran against the Cowboys because they were either behind and had to pass (our run game also forces teams to abandon run because it shortens game) or opposing offenses were specifically targeting our secondary due to all our injuries/inability to sack the passer.
D ranking against the run is a poor argument to determine how important each of the DTs were to their respective teams success. Donald is the better player, by far, and no matter how much you want to spin it, no sane person could argue otherwise.
And 20 times the production is not only unrealistic, it's a ridiculous expectation.