we see the most simple organisms for the common metazoan ancestor and ancestor of all plants and animals as likely being genetically more complex than most of the animal lineages following so that evolution, assuming it occured, largely occured via a loss of genes rather than a slow, accumulation of them.
Evidence for this claim being? Provided the Darwinian thought police will allow you to post it on this site of course.
TTFN,
WK