Cait Top would indeed be more likely to get you an S.
So is Tristana top, that's how I'm getting mine.
Damn pro players ruined the ranking system because they're so good getting S ranks with the usual champions in the right roles... That the only way to get an S rank is to play champions in unorthodox places that are not flavor of the month... In lower Elo...
I've gotten S ranks playing champions in meta roles. I don't think I'd blame the pros but rather a lack of patience.
I just got 5 good games as Rumble where I was fed and all in ascension, where gamemodes are easy to get S ranks (Since about 10 people in total got those) and I wasn't even close to A+.
It's not patience, it's the game expecting me to go like 20/0 to get an S-. Just not fair that I wasted my entire afternoon trying to get it. I can't even get an S as Rumble Jungle because the game again expects me to try hard so much and to do the work of 2 diamond players at the same time.
Just not fair that I wasted my entire afternoon trying to get it.
I'd say it's suppose to take a week or so of trying to get an S. Anything sooner than that and it's just luck.
I've been playing Rumble for a while now. It's all about landing your ult right and chasing down targets once you buy Rylais. But still painful.