"For every story like Manoah’s (or, say, Nate Pearson’s) there comes along a Roy Halladay or a Dave Stieb who becomes the backbone and anchor of a pitching staff"
This is more like for every 20 stories like Pearson or Manaoh there is a Halladay or Stieb.
I don't think you sign Trey to an extension right now when his value is arguably at its near peak. I'd want to see how he handles the inevitable adjustment the league makes to his uniqueness first.