Why are you willing to dismiss this as a possibility before you have the data? It's obvious that chimps are closely related to humans as we share a common ancestor. Whether the overlap is 98% or 90% does not really matter.
Stephen: Following the recent findings of other fully sequenced genomes that they
had a large number of novel genes, it may well be that humans will turn out
to have a large number of novel genes that have no homologue in their
nearest presumed relatives, the apes, and thus cannot be explained solely by
Darwinian ancestral descent.
Well one can always hope. But of course you are merely speculating without any evidence.
Next...