While I’d guess the WAR averages here are largely wrong for the relievers and #3-5 starters, I don’t think this is at all reflective of true value.
Duran, Jax and Varland all returned a better haul than Bailey Ober would have ever brought back. High leverage relievers are more valuable than #4-5 starters despite throwing fewer total innings. Often more valuable than #3 starters.
That said, Rojas is one of the few I like to possibly be a #1-2 starter.
Also, I’m glad this article points out that multi inning relievers are at the absolute bottom of the totem pole. Your most electric failed starters should be pushed to the high leverage situations. Your inning-eating, just-get-me-to-tomorrow pitchers should be the waiver wire fodder you don’t mind casting off in a month.