I remain in awe of your left-brain! Tides--math specs--WOW!
But my right brain is saying:
Hey! The Cha's are in that boat too--why can't they be first?
Is the fall all misdirection? Could Charla be hurt?
We never saw it coming? Any other ideas besides
Romber elimination? (Not that I don't think they are not out--just maybe something else too? In medicine, we call this 'looking for zebras'!)
And if they are all separated by 20 minutes, how the heck do we end up with a foot race to the finish? Are some teams' brains really more than 20 minutes slower?