It is not a coincidence. However, the whole discussion is on how the relationships occur, not that they occur. Neither the TOE, nor ID, nor "the aliens dumped a zoo into the ocean" are stated in any way that I can see that would permit one to verify one over the other. Any serious and consistent discrepancy here could be construed to falsify all of those 3 hypotheses. But since that is not the evidence, none of them have been falsified.
TOE says random mutations are the cause of diversity - and guess what you see when you look closely at the genomic structure of organisms? A jumbled, jury rigged mess that seems to work despite its woefully inefficient "design". IOW it looks like the culmination of a whole bunch of random events at the DNA level- unequal crossovers, duplications, substitutions, retrotranspositions, pseudogenes etc.
Now thats good enough for TOE. The observations fit the theory perfectly here. Can I completely rule out the possibility of an incompetent designer? I guess not. I would just rather not believe in such a thing.