Yeah, but remember, Dumbledore said that the prophecy could have been either of the two. Just cause one was marked, physically, doesn't mean it HAS to be that one. The other one has been marked emotionally from seeing his parents in the state they're in. Old Voldy coulda made a big mistake. Could be a devious plot twist a comin!
One never knows, does one?
No, Voldy 'marked him as his equal', remember?
I just reread this two days ago. It's definitely Harry. Unless Dumbledore's lying, which could be - certainly he's telling Harry the truth at a convenient time...