Well... I wouldn't call it impossible but it's definitely not unlikely.
The only reason I'm even giving this thought is because Sasuke's defeat was so abrupt. Hype is everywhere, Sasuke is going towards the battlefield with his hawk, he gets a Hashirama Jutsu and he gets taken out negative difficulty. The way Sasuke literally jumped off his Hawk [his advantage] was weird and the things Madara said sounded weird. I don't know, I think there's more too it.
Regardless, Sasuke is going to be pissed off when/if he recovers.