There has been a recent discussion on rebloom and I happened to remember I had a few photos of pre-bloom and instant rebloom from 2010.
One way you can have two scapes per fan - but is not instant rebloom - is something that I think only happens in the north. I live in the North, so I am not sure about this - because I have only heard it discussed up here. The pre-bloom scape. It is a left over rebloom scape that does not bloom late in the year before for some reason. You might think there is two scapes per fan. But look close and you will see that the scape is coming up from
outside the fan.
If you look on the left of the fan on the left, you can see a scape that has a spent bloom on top. Then, in the middle, and right, a smaller scape that has not bloomed yet.
But, if you look at that scape on the left closely at the ground level, this is what you see.... the scape is clearly coming from outside the fan.
With instant rebloom -- you have this look of one scape taller than the other, and the second scape coming up right after the first one.
And, this is what the instant rebloom scape looks like at the base. You can clearly see two scapes coming out of the same fan.