My reading of the refutation is that Camp is suggesting that
ToE can accomodate the situation where there are universal traits
and the situation where there is complete difference.
He is then saying, not that the evidence is wrong, but that the
evidence cannot be used to support ToE because contrary evidence
would also support ToE.
The same argument can be levelled against creationism of course
(a designer could re-use designs or make brand new ones equally
well).
I think, from the quote from Theobald, that what he us actually
saying is that if evolution happened we should expect to see
fundamental functionalities that are the same across different
species. Not lots of minor traits, or even universal traits,
but fundamental traits.
Such as all plants photosynthesising, all animals and plants
able to respirate (if that's a word).
We do see this commonality, and lack of it would tend to be
more against evolution than for it.
It's also compatible with common design.