I don't. I just know what I see. I see not only how ZywOo and s1mple play but how their teammates play tactically. I've seen moments when s1mple had to sacrifice something because his team asks him to (like the example of giving away the AWP to GuardiaN). I've seen multiple matches from not that long ago where s1mple took a more supportive approach (dropping pistols and buying nades in pistols and whatnot).
I also go by the logic that mainly the coach and IGL decide how to use each player. If s1mple decides what he is going to do within the team then it's another problem entirely. Of course, players have valuable inputs but ultimately coaching decides what to do.
I know it's just his word, but as a NAVI fan, I've heard him talk about it multiple times. What he wants the most is for his team to win and he'll do whatever the team needs him to do.
This does not change what Snappi said. He analyzes the demos of both players and concludes that for him, ZywOo taking space for his team and allowing for more stars to play is more valuable than s1mple playing more defensive and setting himself up for late-round. Regardless of what Vitality and NAVI choose to do with these two great players, most people seem to miss that they are two sides of the same coin. ZywOo takes space for his team and allows teammates to close the round. s1mple's teammates take space for the overall team and set up s1mple for closing the round. If ZywOo's teammates can't close the round, Vitality fails. If s1mple's teammates cannot take space and open the round, NAVI fails. Multiple rounds have been won due to ZywOo taking so much space and opening the round for his team and just as many have been won by s1mple clutching or making important late-round plays.
Two sides of the same coin.