I’ve always felt the pocket comes from the band members collectively feeling the pulse more so than being regulated by the downbeats. A mutually experienced sense of time, if you will. And if bass and drums do their job, this is reinforced and supports the other players to play their best, imho. This kind of pocket is my happy place. I’ll gladly hold the groove for 30 minutes while the rest of the band does their thing, no problem.
If you want an idea of what a collectively experienced time/groove/pulse is, throw a track by The Meters in your DAW.
George & Zig are with each other through and through, but visually, the downbeat ain’t always on the one as defined by the software. At least this was the case with the software in my music school days 15yrs ago, not sure what kind of adjustments modern quantization algorithms are capable of.