Okay, so let's confirm...
it's:
(setup)
Footstool
aerial Down toss
Drift to chase trip animation
Air Catch
(loop)
Down toss (+ land)
instant Footstool (on a tripped Diddy)
Air Catch
aerial Down toss
Drift to chase trip animation
Air Catch
And repeat.
The landing downtoss may or may not be initiated on the ground; doesn't matter.
Mentally wrapping my head around the groupings of the Air Catches will be tough for me. That Down toss is arranged before the first Air Catch, because that Air Catch refers to that Down toss, despite how I want to see this queue.
The key is ... well, the Air Catches. First, you have to grab one off the Footstool. This relies on how the banana bounces up when it's thrown down. Second, you have to fit the down toss AND second Air catch in that footstool, which has to be a short footstool.
And through it all, you have to chase Diddy.
How do you predict which way he moves?
*~*~*~
I wonder if this stuff will bring Diddy down the tiers. Only we can Banana Choke, but anyone with a similar air physics should do this air catch, right?
Then again, Ganon is neither floaty nor a fast faller, really. Link wouldn't get both air catches, Game & Watch arcs too slowly.... could Pit do this?