Well... This question has been asked multiple times, as others have said, but I may as well throw this out here.

If it's your first kage super rare, then there's a 50/50 chance for it to be either one, so you do have a chance to get Sasuke, assuming you haven't already got a kage super rare. The second kage super rare is always the other one, so if you were to pull Ay first, you'd get Sasuke second, and vice versa, getting them through events will not influence this.

The 50/50 was meant to mean you have a 50% chance for either one, I can see where you'd think I meant it's 100%, or 1/1, but it was intended to be read as 50% for each one.