I have video of a shoot with 3 cams. One of the cams is shut on/off during the shoot several times. I've used the new audio sync function in CC to make one multi-cam timeline. However, it ends up with about 16 camera's. Every time the cam is stopped/started, this will be a new camera. Is there a way to merge these "camera's" back into a single camera?
Not automatically, no. You'll have to move the clips down to the appropriate track manually, then delete the extra tracks.
(And next time, leave all cameras running for a multicam shoot. )