As far as I know, this treasure in particular doesn't alternate between super rares. Like you, I know this from personal experience.

Back around 2017, I was pulling in this treasure for a super, the week prior to Jin 1 releasing, I pulled Rasa.

Later on in 2017, late september, around the same time as that lucky wheel that dropped Minato, I ended up pulling Rasa yet again, I was not happy, I wanted Gengetsu.

I did eventually free pull Gengetsu about twice, due to me deciding just to use fragments from events to get him. I'm pretty certain I pulled him twice due to the fact he's 3* for me, and I didn't invest any further into him.

So in the end, it looked kinda like this, I'm nearly certain of it.

Rasa-Rasa-Gengetsu-Gengetsu