Solitary, you asked me a stupid question and I gave you a stupid answer. I don't know what the source of intelligence is, but I don't have to know the identity of the source to know something was designed. My car was obviously designed, my home was obviously designed, my clothes were obviously designed, but I have no clue by whom. I don't need to know who designed them to conclude they are the product of intelligent design. So your question is irrelevant, and has absolutely nothing to do with the argument.
Now that I have answered your irrelevant question, let me ask you a relevant one. If science doesn't know all the answers, how can it possibly conclude there wasn't an intelligent designer? Seems to me, if that possibility exists, the theory is validated. We can't say intelligent design is scientifically impossible, because science is incomplete, we don't know everything. Perhaps there is a scientific explanation for intelligent design... but will you ever find that if you don't look?