One is often dangerous because fighters do not take the appropriate time to fully recover from being fully put out.
Overeem has kind of a deceptive loss record though. A lot of those finishes had him tapping out due to strikes because he was in a bad position, but they're instead listed as a TKO. Still, you have the finishes with Shogun, Chuck, Kharitonov, etc.
It's worth speculating, but take everything with a grain of salt because every person is different.