You are wrong.
A hypothesis is a "guess" that if verified becomes a "fact of science".
A theory is a general system of verified hypotheses that explain an observed fact. Evolution is an observed fact and the theory of evolution explains it. A theory is not a guess. It is falsifiable. If you could show a legitimate human skeleton in the same strata as a dino fossil, the ToE would be discarded.
Science doesn't really deal in "proof". Proof is more of a legal or mathematical term.
There is NO EVIDENCE man was once another species.
Now we are getting into an area I know a little about. I remembering doing lots of proofs in axiomatic geometry.