Usage of could have happened
A : How are you?
B: I am great. Quitting the band was the best thing that could have happened.
This is a dialogue and I still do not know what "could have happened" means there.
Does it function the same as in
A : Someone was asking for it.
B: It could have been Tom.
Thank you so much as usual and take good care.
Hero of the day
Person asked the most questions.