The evidence for the fish to amphibian evolution, *including the development of legs* is well documented in the fossil record.
The process of developing novel features through gene duplication and/or modification of regulatory genes has been reproduced in the lab.
"If you cannot see degradation in the loss of leg function, then it is no surprise that you merely require a complete absence before you accept degradation. Stopping early is a loss of the information necessary to complete the formation.
Wasn't it you that was complaining about the use of DNA to explain all features and functions? Now you invoke the dreaded 'information' canard? Try to be more consistent.
The fossil record is a time sequence imposed on the evidence by men.
Fossil 'reworking', missing layers and 'overthrusting' are regularly invoked to explain anomalous fossils and strata appearing where they shouldn't.
And 'gene duplication' and 'regulatory gene modification' produces only freaks that would be eliminated from the population, not new more fit creatures.
If the DNA information is corrupted such that the cell cannot use it to proceed in the development, it is loss of information. No inconsistency, just a lack of understanding on your part.