This is fun, but my only problem with Barbara as Batgirl remains her motivation, or pretty much complete absence of same.
Gotham is a city that seems to empower it's heroes by loss. Batman is completely motivated by loss, as were Dick and Jason (in different ways), Tim was a deliberate attempt to alter that situation, by making his role of Robin be about responsibility and Batman's NEED for a balance. The tragic loss came later (though his Mum's early demise "helped") and came by the truckload, with loved ones being felled like wheat chaff.
On the other hand, Babs motivation was she had the costume on to go to a party, and enjoyed the thrill of it. That's a much, much weaker motivation IMHO, especially in Gotham, and when she was one of only TWO people to actually wear the Bat (Not counting Batwoman and Bat-Girl I suppose) and was only viable as long as it was never mentioned.