I'm not sure whether he is or is not a SOP and it isn't for me to judge but for entertainments sake I would like to comment. Peter had it revealed to him by the father whom Christ was:

"Matthew 16:
15 He saith unto them, But whom say aye that I am?

16 And Simon Peter answered and said, Thou art the Christ, the Son of the living God.

17 And Jesus answered and said unto him, Blessed art thou, Simon Bar-jona: for flesh and blood hath not revealed it unto thee, but my Father which is in heaven ."

Did Peter know enough to become a SOP? He never actually denied Jesus was the Christ. If Peter had enough revealed to him could have Judas as well? I'm sorry if I only have added more questions and less answers.....