http://www.firstthings.com/web-exclusives/2014/04/a-prayer-for-death
On the Lord's Prayer
"Some scholarship asserts that the prayer did not originate with Jesus. He never said it. It is instead the collective work of early Christians who strung together a number of ideas, thoughts, passing remarks and the like that Jesus may have offered at one time or another to anybody listening. I cannot say which is more surprising: rejection of the prayer as Jesus’s own, or the notion that a church committee could have agreed on the wording."
If Jesus did, at various times during His ministry, pray all the petitions of the Lord's Prayer, and only later did the Apostles string those petitions that Jesus taught into one single prayer (or technically two, since there are slight differences between the two times it appears in the Gospels), does that make it any less the "Lord's" Prayer? Presumably, whatever prayers Jesus prayed that his disciples heard, they were probably repeated more than a few times. Would that make a difference?
I'm not arguing that point. I'm just asking.