Why is the prayer in Matthew 6 called the disciples' prayer instead of the Lord's Prayer?
The prayer in Matthew 6 is called the disciples' prayer because the Lord gave it as an instruction and example for His disciples to use, not as His own prayer. The real Lord's Prayer is John 17, where He pours out His heart to the Father for His chosen ones.
Les teaches that the title "Lord's Prayer" is inaccurate for Matthew 6 and says he rebels at that title. He explains that the Lord merely gives this prayer as an example for the disciples to use, so it is better called the disciples' prayer. The real Lord's Prayer, Les says, is John 17, where the Lord pours out His heart to the Father on behalf of His chosen ones. In Matthew 6 the Lord is instructing the disciples how to pray, and He presents it as a pattern—not requiring every prayer to open with those exact words. Les notes it gives an indication of how to approach the throne room: even though this setting is still under the Law and Jewish temple worship, the format carries over into us under grace, because we still give God His due and recognize Him as the Almighty and our Heavenly Father.