over changes and I thin perhaps they weren't thining of them as 2 separate blocks one for each hand, but as one whole thing. The other advantage to not seeing it as 2 hands I believe is that it's easy to say, well that chord needs one less note, and just play the chord and let the fingers figure out who plays who, as opposed to trying to keep balance or saying "well, there was 4 and 4, now theres 4 and 3, i should probably take one out of the left hand too to make it balanced" when the balance perhaps doesn't lie in number of notes in each hand but simply what the music needs, which might not always makes sense in the pattern/balance-seeking frame of mind. I hope it makes more sense or atleast shows what I'm thinking better.  Tl;dr, "Gb7 on left hand, Bbadd9 on right hand" turns into G-Bb-D-F-Bb-C-D-F.
oh you meant Gmin7. the example i gave before was for Gb7. --- Gb7 actually means Gb dominant 7