Here's my exact issue with Stan, because it's far more detrimental than winning a clutch round:
Stan will play in a position solo. He will get a kill on the opposing team, and knows that there are 1 - 2 players following for the trade, but he can get out. He will retake the fight, alone, and typically dies. Sometimes he'll get a 2nd kill, but routinely he is traded to equality.
What's erroneous about this is that it happens a lot. Further, he will make this play on rounds where his team is up in numbers, and lose the advantage. I've also seen this happen a number of times where his team absolutely needed to win the round to avoid economy reset, and he basically puts his team into a hard-to-win scenario (he was so bad about this in Optic on CT side of Cobblestone).
It'd be one thing if he was anchoring a site by himself, but often he has at least one player in the area but cannot play off of them (I said solo above, but I mean that he's isolated not specifically in a site alone). That's a mistake someone of his caliber should already understand, and it's a big gap in his potential to become an absolutely amazing leader.