Just to clarify, there are "two" TDC positions if you look at the crankshaft only.
However, this is narrowed down to one "true" TDC by checking the valvetrain (which the cam rotates at half crank speed).
On the compression TDC both valves have been closed for the prior half a crank revolution (more or less) and on the exhaust TDC the exhaust valve will have been open for the prior half a crank revolution (more or less).
Important to pick the correct one as firing the spark on the exhaust stroke just wastes spark and won't let the engine run.
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