what is generally regarded as a musician's 'time' is not
about where they come in, go out, divide bars, or any other technical failures..those are amateur shortcomings.

what is meant is how steady or unsteady the tempo is..do they drag, speed up, or some of each...this is distinctly
different from their "rhythmic feel" or lack of it..and

among even great musicians there is variation between those who like to play right on the beat, just ahead, or just behind.a great rhythm section needs more than good musicianship, it needs unanimity of beat-feel, too.