thats nothing to do with genlock- (genlock is just a way of synchronising the frames on video equipment before digital signal processing was fast enough )
genlock doesnt do anything to this at all-
this is the digital video processing pipeline.
every single piece of digital video equipment - including imagepro projectors cameras catalyst and whatever else - has to buffer at least a frame- and possible many more
imagepros have quite big delays when in certain modes....
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exactly what do you mean by 9-10 frames for the camera chain? - please detail every single piece of equipment including splitters.
( on a large rock show 9-10 frames is 1/3s which is a distance of 100m for sound - so usually 9-10 frames means the video is in sync with the sound at front of house! )
light and sound reach the audience at vastly different speeds and on large shows the sounds is only 'in sync' at a certain distance - and at no other- if it is in sync for the band playing - then its not in sync for anyone in the audience ....