2143430: what i understand, no you don't gain control of adam eternum because he is not in your RFG zone when his power activates he goes into his owners rfg zone so when he comes into play he enters play into his owners portion of the play field
415.2 All players share the chain and play zones. Each player has his or her own deck, graveyard, hand,
and RFG zone. If a card is put into a deck, graveyard, hand, or RFG zone, it’s put into its owner’s
instance of that zone. Some modifiers explicitly put a card into the deck, graveyard, or hand of a
player who doesn’t own it. If that happens, that player owns that card until the end of that game.
Not quite. When you use Adam's power you create a modifier that instructs you to put him back into play at a specified time. The player who puts him back into play is locked in when you use the power (as information the game needs to create the modifier), and as such the RFG zone he goes to doesn't matter: the game will put him back into play under the control of whoever used his power, not the owner of the RFG zone he goes to.