First listening from Tidal.
It’s curious. Dave and Rick voices are crossed backwards. In the Fronts, Dave is on the left and Rick is on the right. But on side and rear surrounds, they are backwards, Dave on the right and Rick on the left.
Since you hear more the side surround than the front, it appears that Dave is on the right, but really both voices come from mixed directions in a strange manner.
Also, yes, the Heights only output very low global echo/reverb in the Top x.x.2 bed channels. I.e. in a x.x.4 system they sound the four top speakers, but in a x.x.6 system only sound the Top Middles.
On the other hand, there is content for the Wides, so the mix is pretty good surrounding you at floor level as if you were there, between them at Pompeii amphitheatre, without sound coming from the open sky above.
I like the clear sound of drum cymbals more than the other quad and 5.1 copies that I have.