Flexplate is not fits the torque converter

Hi! another question! if the flex plate is balanced, and torque converter is self balanced, does it matter to position TC vs the flexplate? the stock ATP-Z332 - have one hole moved a bit (that's why it's require hole extension), I'm wondering why? if the ATP-Z332 have it's own weights to balance the crankshaft why it's so important to position it vs the torque conv that in that case should have neutral balance?