Agreed — and that's the impediment (I think) listeners often have in particular when assessing the merit of McLean's Prestige work. It almost can't not be viewed through the prism of what came only a few years later.
There's a fair amount of fire in those Prestige solos, even in warmed-over standards (e.g. "What's New?"). There are also times when, just when you think he's churning out a predictable bop line, he stretches it further, four or five more bars, and then avoids all the ending-phrase notes that bop commonly programs into your ear. Bird did this too, of course, but when Jackie does it, you can really hear him think, which leads me to believe that he often wasn't on auto-pilot.
Food for thought at least.
Agree with you there, Late, after going back to these dates recently.