The title of Are there any verses which say Vishnu is source of all avatars? looks fine but the body has several unrelated questions:
Since there are different Vishnus and such complexity in pancharatra, I want to know about root Vishnu from whom all other Vishnus and avatars emanate.
Which Vishnu is talked about when we say Vishnu's 10 avatars. Where does he stay?
What happens to this Vishnu when mortal world destroys?
What happens to chatur vyuha of mortal world?
And I can't vote to close it as 'too broad' because of an open bounty.
This looks like a loophole in the system to ask off-topic/too-broad questions and immediately start a bounty to prevent closure.
