The only way it would help is if we had some other way to rule out asteroid impact ejecta but not probe contamination. So we'd have: 1) Life on Enceladus that's

The only way it would help is if we had some other way to rule out asteroid impact ejecta but not probe contamination. So we'd have: 1) Life on Enceladus that's 2) genetically indistinguishable from Earth life, which 3) we know didn't travel on a rock, but 4) could have travelled on a probe. We're getting into teapot-orbiting-Mars territory.