I don't think the egg or replacer is necessary in that recipe as flax is already a good binder itself. Gound flax paste actually IS a commonly used binder by vegans, so I hink it wold do just fine without it. And those flax cracker sound interesting. I've never heard of such a thing! Probably because the idea of low-carbing is as foreign to most vegans as veganism is to most low-carbers! Funny how that works.