I see the "DNA reflex" as a survival mechanism, so the body structure in development is formed to be analogous for survival but not identical.
The "Runner" is a beautiful design and an example of this.
It has no protrusions to compromise it's aerodynamics.
It inherits a quadrupedal stance rather than bipedal, but this doesn't compromise it's efficient nature.
This is the logical conclusion from an animal in my opinion, to maintain what it is.