Actually, I wasn't recommending daisy chaining the timecode, though I suppose I wasn't very specific. That said, I've never actually seen an image problem in a Varicam caused by bad timecode, even in testing with deliberately bad signals - as opposed to bad genlock which can very easily wreak havoc.
The safest thing really would be to just periodically jam-sync the cameras and let them freerun for a couple of hours (or less) at a time.
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Jesse Rosen
Director of Technical Development
Abel Cine Tech, Inc.www.bustedskull.com