Colossal symbols on slots

Hi, everyone,
I got confused about calculating colossal symbols.
It looks like stacked symbols, but it takes a lot of space and crosses the reels(maybe 2x2 or 3x3).
Just like Spinata Grande and King Colossus.
If the colossal symbol crosses the reels, does it mean those reels spin synchronously(used the same rng)?
If it does, how to calculate the symbol combinations?

Thanks for taking the time to read this.
I would be very Grateful for any help.

Hi, everyone,
I finally come up with a way to deal the colossal symbols.
In Spinata Grande, colossal symbols come everywhere. They maybe 2x2 or 3x3.
To abbreviate, I call them colossal-N reels if the max size of colossal symbols on it is NxN.
After watching the video over and over again, I realized there may be some reel combinations with different probability to use in the slot.
For example, 50% for single reel x colossal-three reel x single reel,
20% for colossal-three reel x colossal-two reel,
30% for five separate reels.

The final part is to calculate the symbol combinations for colossal-N reels.
The only way I found to do this is using the brutal method.

I would be grateful if anyone could give me some comment.
Thanks for taking the time to read this.

As i remember, in original netent reels of Spinata Grande they use more reels sets, and mix them for make tricks of calculations.