That's just something creationist say scientists believe. No one really thinks that, not even Stipe. In fact, the argument is that a long string of intermediate forms shows that lobed fins became first legs for getting around on the bottom of shallow bodies of water, and then for the occasional foray onto land. Only much later were they primarily for moving on land. Oh, and lungs were there long before legs, so that wasn't a problem, either.The femur and the tibia/fibula were there long before fins became legs. The hand/foot, however, is something new. The evidence is that one Hoxd element was flipped producing feet.
[IM]http://9e.devbio.com/images/ch16/160401_s.png[/IMG]What evidence?Biology BulletinVolume 36, Number 2, 139-147Conference ProceedingsMorphogenetic approach to the formation of paired limbs in the course of tetrapodizationE. I. VorobyevaShow us that. Or is this like your "math that disproves" evolution?