Biological intelligence and morphogenetic fields

I've often wondered how the bodies and organs of siamese twins,
despite the obvious abnormality of their overall body structures still
manage to adapt so well to each other and function so well as often is
the case.

I particularly think of the Hensel twins, which is an example of how
two bodies can "fuse together" so perfectly coordinated that the
result is an organism which is practically fully as well functioning
and healthy as a normal, single human body.

https://www.youtube.com/watch?v=piIAx8HUH-s

There seem to be some kind of intelligent biological coordination at
play here which cannot be explained as a result of standard evolution,
since siamese twins isn't a species in itself with an evolutionary
timeline where such a coordinating system could have be developed, but
rather an exception, a biological mistake, very unfit for survival,
not to say reproduction. So where would this adaptive and coordinating
ability come from then?

Now there seem to be experimental evidence for such an advanced
biological intelligence. Quote:

"If we want to understand biological intelligence or make bioinspired
technologies these are the things we have to really think about.
Intelligence I think is pretty much everywhere, we have to get better
at being able to recognize it, and I think a large part of that is
going to be to understand the input that comes neither from the
hardware/genetics nor from the history of evolution."

https://www.youtube.com/watch?v=ErgpNthZnak