I was thinking of using the EBlock module to connect a Spider to a Cobra with JST cables.
The EBlock module allows for setting the power pin on the JST jacks to 3.3V or 5V. The Cobra sets the power pin to 5V. Having both sides of the JST cable sourcing power does not allow for easy connection.
Of course, the easy solution is to cut the power wire in the JST cable, but a better solution would be to replace the two position switch on the EBlock module with a three position switch, with the center position not applying voltage to the JST jacks.
Something for GHI to think about in their spare time.