To be fair it would be best to wait for pictures it could just be Shock and awe.
Remember Roger thought Ace would be the one to do it/Joyboy but he wasn't, Oden could have thought something similar with someone else.
But now Luffy is Joyboy the person Roger and Oden have been waiting for and here he is he is also Aces Brother and someone who Yamato been waiting for and for Momonosuke the one who helped him get out of his shell all the way back in Punk, its a shock.
Remember Roger thought Ace would be the one to do it/Joyboy but he wasn't, Oden could have thought something similar with someone else.
But now Luffy is Joyboy the person Roger and Oden have been waiting for and here he is he is also Aces Brother and someone who Yamato been waiting for and for Momonosuke the one who helped him get out of his shell all the way back in Punk, its a shock.
It weird That Yamato can't put dot together that Luffy is Next Joynoy after read Oden Book many time.