Detecting design or intent in nature

[Chas]

Nope. The speed of light is a constant that is intrinsically tied to all of physics, e.g. Planck' constant, electrical charge, the mass of the electron.

This is yet another poor example since this is not at all parallel to your argument.

Pro tip: The term is "disjoint subset".

Any theory will ultimately rely on observed constants and not ones which are derived. Observation will always leave you with disjoint subsets because you can't observe it all. According to your logic, measuring the mass of protons in a lab on earth tells us nothing about the mass or protons in the Andromeda Galaxy. Maybe you've discovered the source of dark matter. Its not really an unknown particle, its just that protons on earth are a little light.

Do you see why I reject your thinking?

Reject away, but your example isn't very good.

The difference lies in the fact that the speed of light being constant is supported by evidence.
You have no evidence that biological evolution requires an intellect.

In fact, it has been shown that it doesn't. Evolution automatically follows as the inevitable result of imperfect replication of replicators.

Your argument seems to be with abiogenesis.