@farmerman,
Following along, because it deterministic DOES NOT men its "intelligent"> For the same reasons we know that when , say, bilateral symmetry made its appearance in the late Vendian, ALL life then developed from that root. The basic body plan was thus established and follow on "bauplans" used that as a template. (NO INTELLIGENCE REQUIRED)
Non bilaterally symmetric fossils were seen in the Paleozoic and these were apparently "fiddlings" with a unique body plan that apparently didn't prove successful wrt to the environment. Many of these "trial body plans" are seen in the Edicara, Flinders, The Martinsburg, and the Burgess Formations. ALL of those fossil assemblages became extinct SAVE 1, a little thingy that looked like it hAd a backbone . We named it
Pikaia. It became extinct but did it serve as a model Bauplan for notochords?
Placoderms , in their sternsides, were very similar to Pikaia, except that they had armored "head ends" and, although they were bearers of true notochords, they produced annelid-like larval forms that were later abandoned in the Mississippean when true bony fish became dominant.
Once a body form is set into play, it usually does NOT die away , that would be random. However, as we study the forms based upon their fossils, we can see that subsequent body forms were "pre-determined" by ancestral forms.
We see the same things in species in which we can study their genomes. (Watsons book DNA) gives an excellent discussion of the dependent genomes and percentage of retained genes in daughter species nd higher taxa.
However, its on you to explain your evidence that shows INTELLIGENCE is behind evolution. Scientific evidence does strongly support a deterministic natural selection that is environmentally controlled , is opportunistic, and shows inheritance of characteristics. By genetics, all things are related, and genomes of totally different Phyla (where they've been worked out) show descending ancestral relationships