Go watch some trader university videos. He does great breakdowns on each of those topics which will give you a better understanding of why those scenarios both won’t play out, and also are practical and wouldn’t impact Bitcoin long term
As for the Satoshi coins specifically, even with 100% of the miners you still need the private key to produce valid transactions which nodes would accept. Blocks with invalid transactions (not double spends of legitimate transactions but actually fraudulent transactions) would be rejected and ASIC power would have then gone to waste