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Quizz: Groundup, treesdown and Evolution.

Following the MOST POPULAR Thread Ever some basic questions:

If Deinonychus'-like 'wing' was enhanced and developed by predatorial
strokes, what would be the 'evolutionary logic' of a ground predator's hand
losing fingers?
Wouldn't it be more efficient a down stroke with five clawed fingers
instead of three?
What was that that made dinosaurs start losing fingers in the first place?

And also, what would be the 'evolutionary logic' of a quadrupedal land
animal in becoming a compulsory erect biped?
Speed is not. So what could it be?
Can someone give me an example of a compulsory biped that didn't have
arboreal ancestors?

Thank you in advance!

Luis Rey

Visit my Website on http://www.ndirect.co.uk/~luisrey