The discussion is a moot point, he probably read the degrees difference on the sprocket markings, irrelevant since the reason for the adjustable sprockets to begin with. You correct with them back to right, or what you want. There is no way to 'confirm' since every engine will be slightly different. The term '5 degrees' also useless unless knowing retard or advance and which one of two cams.
The TDC mark can be useless too since may not be true TDC which needs to be indicated out with a degree wheel. Simply bumping a stop point pin is close but all engines vary there too.