why not both? a speedlite up top and a speedlite down below. ive never seen it but wouldnt it be like the ultimate rig.
I did at game before this. One 540z using CybserSync Rx on monopod below the camera. 550ex on camera bracket. CyberSync Tx connected to pc sync port. Taped everything using gaffer's tape. At the field I ran into some loose connection issues so had to scrap the idea and go back to one flash underneath using eTTL cord.
I will try again maybe at next game.

