Is Consistency the Hobgoblin of Small Minds for Justice Roberts? Herein of Loper Bright and Chevron (7/10/25)

I was just today pointed to Pettu v. Richards, 605 U.S. ___ (6/18/25), SC here, I was interested because, although not a case about Chevron or Loper Bright (citing neither Chevron or Loper Bright or using the word deference in either Chief Justice Roberts’ Opinion of the Court or Justice Barrett’s dissent), Chief Justice Roberts says this (Slip Op. 6, of the Opinion and p. 10 of the pdf (because the Syllabus precedes the Opinion, here):

That usual practice matters for interpreting the statute because “Congress is understood to legislate against a background of common-law adjudicatory principles . . . with an expectation that the principle[s] will apply except ‘when a statutory purpose to the contrary is evident.’”

I am interested in the quote because I am authoring an article on Loper Bright also authored by Chief Justice Roberts. I think it is commonly understood that Chevron deference had achieved the status of a common law adjudicatory principle by the time Loper Bright was decided. So, how could Chief Justice Roberts say with a straight face (or maybe a straight computer keyboard) that the Court should honor common law adjudicatory principles in Richards but not in Loper Bright? Congress was certainly legislating with Chevron as a background common law principle (as Justice Kagan notes in her Loper Bright dissent at pp. 463-464 here and Chief Justice Roberts ignores in his Opinion of the Court in Loper Bright)? (This is my reason for referring to the "small minds" aphorism in the title to this blor.)

If anyone has thoughts on this conundrum, please let me know either by comment to this article or by email to jack@tjtaxlaw.com. If appropriate and the commenter gives permission, I will acknowledge the credit in the article.

* Note that the Loper Bright page numbers and links are to the Preliminary Print (as opposed to the Slip Op.) which has “preliminary” page numbers that may change before the final U.S. volume. And, of course, the Richards quote is from the Slip Opinion not yet incorporated in a Preliminary Print.