Not sure what the question is.
But doing what he does creates a kind of "poly-harmonic-rhythm" (admittedly a homemade term) where the harmonic rhythm of the bass moves in a different rhythm than that of the chords themselves. It's another layer of tension that resolves.
From a strictly harmonic standpoint, I guess you could look at it like this - shifting the bass from Eb to E to A like that implies a harmonic movement of Eb13 Alt to E Dim to A13 Alt (#11), which of course then goes home to the Dm. If you think in terms of chord/scale relationships, the Eb7 Alt & the E Dim chords in this context, as well as the A7 (b9 #11), all imply the same scale - Eb half-whole diminished, starting on a different scale degree to match the particular chord.
Check it out (enharmonic spellings included so as to appease any and all factions):
Eb-E-F#/Gb-G-A-A#/Bb-C-C#/Db-Eb
See? You got all three of those chords in there. And if you wanted to go nuts and get all theoryheaded at the possible/probable expense of the music, you could construct a whole little mini-cycle to play before you came home to the Dm. Although I don't know how much I'd enjoy hearing such a cycle fully outlined in the bass/left hand (too dense/cumbersome to really swing, perhaps) using such a construct in the right hand (i.e. solo line) would/could be pretty nifty. Trane did shit like that all the time, playing lines based on extrapolated/extended changes.
It's crazy, baby!