Chris:
This is interesting information. In terms of "acoustic delay" in reference to swing. I notice this sometimes when I play in the cans on my electronic keyboard. When I play without the digital reverb, the sound and the attack is right on top of me-which feels really bad to me and it's harder to swing against the click. When I flick the reverb on, the sound feels further away from me, the delay feels nice that when I'm playing the pocket, it feels much more relaxed.
This is similar to when I'm playing live and there's some room sound. There's enough reverb time for me to play the sound, listen and play the next sound-as if the slight lag gives me some leeway for physically inching right up into the groove by adjusting my attack-quicker or slower. When I play in a dead room-it feels awful to me and this affects everything. And without good time feel the game is lost.
In terms of the saxophonist telling you play behind vs. the drummer on top. I think through airing out on this thread we established that this might be a myth of sorts or at very least an inaccurate discription of what really happens when the band is truly swinging and some members are playing behind or ahead.(with all due respect to bro' Doug who has the most a$$ kickin time feel of any jazz guitarist playing today

). If someone is playing an implied time, then someone else is playing the anchor or the center.
What he's implying though that is that you are "dragging" with him and the drums are ahead. I'm just not sure this will sound good at all. The drums would be going
dingdinga
ding with the ride and nobody is playing his downbeat ding in this scenario because nobody's playing the beat!
This would mean that the listener's impulse to tap would be to provide the missing true beat that no one is playing and that's what swings--that way? I think this is dubious. I can use my imagination where 3 guys on a triangle are pulling against the center and that this is balanced/swinging etc. But I'm not sure this has basis in sonic reality. Although I'd being willing to bend if someone pointing a record to me where this actually happens.