Is this a new installed timing set, or what are we working on? In all the years of working on this stuff about the only time I have seen a timing chain off a tooth is if it were installed that way. It can happen but the vast majority of the time if a chain goes south it is is because it is running on the plastic sprocket and the sprocket teeth go away and the chain literally spins on the sprocket. When this happens you will have not so cute little eye brows on the pistons very likely along with some bent valves.