Lol. Remember The Five?
Or maybe it was The Six? Hell, it could've been The Seven for all I care. I wonder how they would've looked had KA developed them even more.
One thing strikes me as odd though. The Yeerks were traveling across the galaxy from planet to planet, conquering dozens of sentient beings. But did it ever occur to them that if they really wanted to live on as a species they needed ONE version of a symbiotic relationship? Why take over Hork-Bajirs, humans, Taxxons, Straams, and Maks when a Hork-Bajir can't reproduce with a human or Taxxon (which would be absolute torture). Seems rather tiring trying to move on as a race when your entire species is scattered around the galaxy in the bodies of other aliens.
The Yeerks really just needed one race to form a mutual symbiotic relationship with, like the Iskoort. That should've been Gedds. It would've worked had they not gotten greedy and wanted more. We should accept what evolution and nature has given us. What the Yeerks were asking for was basically an over-extensive and very expensive plastic surgery.