[Antonello]

What rules are these? They can't be very robust as we have scientists constantly saying that evolution is not a theory but a proven fact.

It is highly amusing that creationists make statements like this and then, without a trace of irony, accuse evolutionists of equivocating the word 'evolution'.

[Ford4000]

"Evolution" covers a lot of territory. Some has been proven (mostly that which has been obvious since before Darwin) some is simply the current best-guess.

As I have noted on other threads, science will never ever prove conclusively what causes (historical) change because there are too many unknowns. Anyone who says differently is either self-promoting or delusional.