[blam]

"Now if you toss in a volcano bigger than the one that caused The Year Without a Summer in 1816, then you can kill off most of humanity, and destroy any civilizations that may have existed prior to the explosion."

I agree with your points.

When Toba exploded 75,000 years ago, some estimate that only 5,000 humans worldwide survived.

[Wonder Warthog]

When Toba exploded 75,000 years ago, some estimate that only 5,000 humans worldwide survived."

A more likely explanation for the "lack of evidence for modern humans" is that most of them were living on coastal plains and along river estuaries. The "big thaws" from the LAST episode of global warming then put the evidence 150 meters below the ocean's surface.