Wasn’t 2 the smallest actual number to Greeks? I think it’s clear from the history Greeks did a TON of math but missed this number system and abstraction. And if you say they still understood zero but didn’t have number system to tag along (they didn’t have Hindu Arabic numerals) well a better number system provides so much more math that the argument doesn’t have much oomph. There’s no doubt the Hindu Arabic numeral system, of which zero was apart, was the mathematical development bar none of its time. Did anyone really understand zero before it could do all these useful things in equations? Doubtful. And that’s the most charitable take for the Greeks regarding zero.