A brief comment on the Paavo Järvi recorded performance of Bruckner 2. While he does indeed use the Carragan edition of 1877 as the basis, Järvi appears (according to your description) to make the same edit as in his wonderful RCA/Sony recording with the Frankfurt Radio Symphony; namely, replacing the bland solo clarinet at the closing measures of the "Andante"/Adagio with Bruckner's original horn solo. Not the actual music notes from 1872 but instead the horn soloist plays the very similar, but not exact, clarinet notes from 1877.

Admittedly a small, but IMO not insignificant change, which is just one of many reasons to choose the First Version of 1872 when electing to perform Symphony 2. It is Bruckner's original, longest, and most revolutionary score at the time of composition. Inspired by and infused with the revolutionary fervor of Beethoven 9, which indeed was Bruckner's inspirational lodestar from then onward.