Ah, here we have the crux of the matter! I understand how the earliest days of the Coltrane influence messed w/Pepper, but - eventually he integrated it. Chuck says he "lost much of" it, which may or may not be another way of saying the same thing, but I don't think that Pepper of the mid-70s and beyond (which includes the Vanguard material) was what it was if he hadn't gone through Trane the way he did. In other words, if Pepper had never heard Trane, I don't think that he would have evolved to the point to where he played like he did by the time of those recordings.
No matter, count me as part of the minority (here, anyway) which prefers later Pepper. Similarly, I prefer later Mobley. In both cases, the later work ain't as "pretty" as the earlier, but there's an...immediacy, a feeling that there's no longer a layer of "music" between the music and the emotion, if that makes any sense. Which is not to say that that earlier layer was superfluous, or shallow, or anything like that. Far from it. Just that it seems like in the later work, it was no longer needed, that both players might have felt put upon, perhaps even belabored, to go back and play with that vibe again.
As always, mileages can and will vary.