Forum:Forced Requisition/ Card Destruction/Fine

Forced Requisition/Morphing Jar/Card Destruction
I've been looking everywhere trying to find a ruling for these cards and i keep getting mixed answers of yes, no and idk. so here it is:

If i have Forced requisition face up on the field and i flip morphing jar. Assuming, i have 5 cards in my hand and my opponent has 4. i discard my hand and so does my opponent, what happens after morphing jar resolves and we draw 5 cards? will my opponent have to discard his hand due to forced requisition?There are cards with a similar effect:

Dark world dealings: After we both discard a card would my opponent have to discard an additional card due to forced requisition? similarly, will this same thing occur with dragged down to the grave?

thirdly, my friend told me that i CANNOT activate the trap card fine ( discard 2 cards) if i only have 1 card. Also he said that if forced requisition is in play and he only has 1 card while i activate fine, that he doesn't have to discard his card because forced requisition states that he must discard " the same number of cards." the same can be assumed from a card like the cheerful coffin, if i were to discard 3 cards and my opponent were to have only 2 cards. he says that since he can't discard the "same number of cards" then forced requisition doesn't work. is he correct? Lastly, probably the dumbest question, but when forced requisition is activated and my opponent discards, do they get to pick what to discard or is it random? Thanks