[Question] This is probably why T1 fans dislike Zeus and Gumayusi, right?

It's not that they left T1 because their performance hit rock bottom;
rather, they left T1 while still in their prime, like Zeus and Gumayusi.
But it's not just that they left which is annoying;
it's that they are performing well after leaving.
And when they face T1, they crush them,
and they even went on to win MSI.
Their source of pride used to be that T1 members' performances were negligible after moving to other teams,
but that only served to elevate 'Faker's' status even further.
Finally, looking at players who failed after leaving T1,
they say, "How did they even win championships with players like that?"
"G.O.A.T. Sang-hyeok"
This is basically the T1 fans' template lolololol