They need to check:
1 - The actual profile of the cam.
2 - End float of the cam, under rotation it can move and alter the timing.
3 - The size of the lobes... I don't think they should for example actually ever be the maximum size.
4 - Wear, once the size is measured. If it's showing heavy wear and is at the maximum end of the tolerance material may have been added.
5 - The way oil is retained on the working surface of the cam can also suggest the addition of material.
The timing is free but that is really to allow for variance in how the gear on the crank has been fitted. It's pressed fit and there is clearly a range.
The dots should meet though!
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