Actually, the bigger issue with this is that one has to move away from Owenian
19th
Century, or even embryological 20th Century, style definitions of homology. Our
growing
knowledge of the genetic, phylogenetic, embryological, and related processes by
which
organisms are built are now showing that the same physical part of an organism
(in this
case, the autopodium) can go through several different "identity" assignments
(identity
as an autopodium; identity as serially arranged digits; identity as particular
morphological structures; etc.).