I agree they didn't give equal time to all possible explanations, but given that they can only speculate, I think they probably chose the most realistic explana

I agree they didn't give equal time to all possible explanations, but given that they can only speculate, I think they probably chose the most realistic explanation from among the likely possibilities, and they gave it enough throat-clearing up front that I wasn't confused about whether they were saying they'd proven it or not. I'm not saying they couldn't have done a better job of saying "hey, we're just guessing here, for funsies", but it didn't bother me.