Oh yes, I can totally understand (because I also still have the Zeus XR myself) why this is a great synergy combination!
The Zeus XR is quite analytical (delivering micro details in spades), but it can also use some cable help to bring out the lows a bit more imo. Matching it with an (overly) bright cable would probably be overkill to most ears.
And while we're on the '
synergy' subject: this is still one of my own favorite combinations. The EE Phantom + EA Horus (4w)
Although I also liked the Phantom + Leo II combination a lot (especially its natural timbre came close to perfection with that cable), I ended up with the Horus as that made the Phantom sound even more revealing (details) overall and especially its treble benefited from it to my ears.
So, to me this is (not only a visual) golden combination
Just out of curiosity, are there any more amazing (1+1=3) synergy combinations out there?