I think the first J-Mac albums I heard were, in sequence, Jackie's Bag, Destination...OUT!, Bluesnik, and "Let Freedom Ring". All of them gut-grabbingly intense listens, but only Destination...OUT! sounding really settled, like the search ends and goes forth from here. Not how it happened, as it turns out, but the McLean/Moncur pairing was, and remains, magic to me.
However - the title tune of Bluesnik...that head is so deliberately reductionist, like could you really break it down any more than taht,no, don't think so,left a totally wide-open canvas upon which to paint, and listening to Jackie's back and forth, his internal monologue if you will, going one place and then all of a sudden catching himself, breaking it off and immediately taking it somewhere else, to me, that's not necessarily a "perfect jazz solo" but it's about as bared-bones a look at wheels-turning in real time as anything out there. And the way Freddie takes the handoff, you can tell that all of Jackie's darting about was getting Freddie primed to jump in and get going.
All the best BN records had that sense of timeless immediacy, but the best McLean BNs,...maybe a tad more than most.