Okay... I disagree with that one. The most widely held theory is the equalization of charge between earth and sky. Now the debate begins as to whether the sky is pos or neg, or which is which, doesn't matter, it releaves the imbalance condition which causes a strike.
"Easy path for a strike to follow". Nah, we ain't got wire enough for this, too many amps for a pathway, well, more than once.