[PatrickHenry]

The current thinking is that the proto-amphibians adapted fins into limbs because it enabled them to wriggle through dense aquatic vegetation more easily.

And we still have "walking catfish" moving about on land. Walking catfish .

[Physicist]

And we still have "walking catfish" moving about on land.

There, you see? The fact that we still have them proves that they couldn't be ancestral to anything. ;^)