They weren't leaving 74,000 years ago, they were moving back in. They had been sailing for at least 925,000 years while doing God only knows what else.

This is new to me. I'm familiar with the mt Toba mega volcano, and that's extremely interesting, and legit.

Humans as we understand them may have been around, but it seems likely that the fortunate 5000 or so humans in eastern Africa essentially won the geographic lottery. The lone survivors of extinct city-states, and empires. Everyone else died.

The Neanderthal survived though, which doesn't fit the Toba theory. Even so, it's still the best theory I'm aware of

Homo Florensis (the hobbit people). Are there the orang-pendek (or something) from Indonesia?

There's certainly more to human history than we're likely to ever prove. It's fun to imagine what it must/could have been like.

1,000,000 years ago? IDK. I'd need some compelling evidence.