You have to go through "Fishes" to get to humans from anything ancient. Thus, my point that Fish have never been shown to have the immune functionality of coral and humans looms large.
You had to look long and hard for asimplified tree of life to support your statement. If you had bothered to look for the adult version (linked from the same source as your diagram) you would get this:
http://tolweb.org/tree/phylogeny.html
Your diagram in #223 has an obvious flaw which, if you think about it, leads to the problem with your argument. It’s trying to chart how different forms diverged, but it’s also drawn in such a way as to imply the passage of time. In doing so, it locates fish only in the past—the flaw is that there’s no place in it for modern fish. If you add a fish up next to the bird to represent today’s fish, you need to also add another line extending from the original fish to today’s fish. And a lot of evolution can happen along that line—including the loss of some aspects of the immune system.
Don’t know where you got your “tree” but it’s out of dat and just plain wrong in its implications.