I’m going to go out on a limb here and say
Old @Rodread was likely wrong on the rant I held on catenary sag effect
and @PierreB was likely correct
There’s going to be a droop in the middle of the length of a chain of common axis rotor kites even though they supply more vertical lift than their mass and associated transmission parts need
I am hoping I’m wrong but it does seem intuitively correct
I have not simulated this yet
Can’t say I remember having witnesed it (Genuinely been that long since I flew one 
)