Imo aspas finals MVP comes down to a simple thing: the game was still very heavily eye-test based back then, and aspas had multiple insane moments even if his overall numbers weren't too great.
This round for example; diffing Yay was probably the biggest eye test that year, and that round basically won them Champs. And I think they felt almost compelled to give it to the only opponent who pushed Yay all year, and not just based on the finals/event performance. But I agree, Sacy was just on a different level that final.