Sounds like your friend isn't caught up. You shouldn't spoil it for him.
He showed himself to Luffy. Luffy cried and said that he always thought he was dead. We haven't seen Sabo's face or anything, but Luffy's reaction and his clothes pretty much confirm that it's Sabo. There's also this panel:You must be registered for see links
he is actually caught up... he just doesnt know how people can say it's Sabo that Luffy is speaking of when saying something like: omg he's alive... i thought he was dead" ???
manga scans perhaps?i wanna show him how we know it is Sabo!!
how do we know it's not Ace??
i dont read one piece... i just wanna know cuz my friend didn't believe me when i told him Sabo is alive according to NB people?
pls help!

how do we know it's not Ace??
Sabo is alive and got rescued by Dragon. Even though he's same age as Ace, he still looks like a kid.
Hmm, cause Ace had a huge hole on his torso and his inner organs got fried.how do we know it's not Ace??
We all did. It was never mentioned in a chapter, it's a theory that goes around quite sometime and seems highly plausible after the recent events.I missed the chapter that said this.
Hmm, cause Ace had a huge hole on his torso and his inner organs got fried.
That person also mentioned "we must inherit his will", by getting the mera mera. I don't think Ace would refer to himself as "that person".
Luffy mentioned "I always thought he was dead". Ace died two years ago.
And most important, if Ace was alive his devil fruit wouldn't have reappeared.
Unless he's Gandalf and got resurrected.
We all did. It was never mentioned in a chapter, it's a theory that goes around quite sometime and seems highly plausible after the recent events.