"Plausible? How about highly probable to the point of being virtually certain? Again, there was no serious doubt that the cuneiform tablets we've found were artifically created, prior to our being able to understand what was written on them."
No matter how highly probable it may have appeared, we still needed to test it. There was a means to test it. Unfortunetly ID has no such advantage. You are not answering how it can be tested regarding evolution.
That's because I don't agree that such a step is even necessary in order to establish the validity of the theory. As I said, not knowing what was said on those tablets in no measurable way diminished our certainty that they were intelligently designed. We therefore didn't "need" to decode them in order to come to that conclusion. We did it anyway in order to get more knowledge about them.