I hadn't thought of this. But this means they would be neglecting the Water starter...
Still, I highly doubt that Fennekin would evolve into Y-Bird. They look nothing alike at all.
Yes, because oshawott and samurott look SO much alike. anything is possible.
Oshawott and Samurott have visual and specie connections still. They are both aquatic creatures and mammalian. Oshawott = otter, Samurott = sea lion.
A little fox and a giant bird do not. There is nothing visual connecting the two and they are in completely opposite ends of the specie department.
The logos, the press release, and every mascot since G/S lead to them being legionaries. You have a point that not all evolutions look like their previous, but there is too much evidence pointing away from this theory.