There are no rules for knowing which route to pursue or when to change approaches. Finally, it is true that any collection of data will support several alternative theories. This fact says nothing about the validity of the different theories. First, currently it can't be done. Second, it is unfair to require this level of proof for evolution and not for progressive creation.
Fossils are facts.
This is incorrect. Evolution and natural selection represent valid scientific hypotheses to explain how the different species arose, just as much as the theory of design does. However, to make conclusions about the existence or character of a creator based either on the empirical evidence or as part of the scientific theory itself, is metaphysics. If you insist that evolution theory is not separable from metaphysics and is not a legitimate scientific concept, then you have to accept that design thoery also is unseparable from metaphysics and is also not legitimate science. I must clarify that my position does not exclude so-called world views from science.