Stumbled upon another small observation today and for some reason I've been in a sharing mood. lol.
Compare the Synoptic variations of this pericope.
Mark 8..
Peter answered, “You are the Messiah.”... Jesus warned them not to tell anyone ...
...Then he called the crowd to him along with his disciples and said: “Whoever wants to be my disciple must deny themselves and take up their cross and follow me. ...If anyone is ashamed of me and my words in this adulterous and sinful generation, the Son of Man will be ashamed of them when he comes in his Father’s glory with the holy angels.”
Matt 16:
...he ordered his disciples not to tell anyone that he was the Messiah....
24 Then Jesus said to his disciples, “Whoever wants to be my disciple must deny themselves and take up their cross and follow me. ... 27 For the Son of Man is going to come in his Father’s glory with his angels,
Luke 9:
Peter answered, “God’s Messiah.”...Jesus strictly warned them not to tell this to anyone.
23 Then he said to them all: “Whoever wants to be my disciple must deny themselves and take up their cross daily and follow me. ...Whoever is ashamed of me and my words, the Son of Man will be ashamed of them when he comes in his glory and in the glory of the Father and of the holy angels.
Notice in Mark Just after instructing his disciples not to disclose he was the Messiah, Jesus calls a crowd and identifies as the Messiah, the Son of Man. Did the author of the revision later called Matt notice this and attempt to fix it by removing the crowd and have Jesus instead address just his disciples? It looks that way. Then the poor author of the revision known as Luke comes along sees both Mark and Matt and decides to simply obfuscate by saying "all".
Comparing the Synoptic authors allows us a peek into their minds and the decision process.