PvE 5 star rotation?

I was wondering if there is a way to tell which classic 5 stars get rotated in to PvE after the 3 latest do their rounds?

https://forums.505go.com/discussion/83560/new-classic-legends-essential-order-in-pve

But, we’re getting Knull shards for placement, doesn’t that mean he’ll be required next? Again?

Going by this list Thanos should be required in progress… I’m so confused now. I guess at this point anything is possible…

@Ed_Dragonrider, ‘I guess at this point anything is possible’ is an accurate description of all aspects of the current game unfortunately.