The Bible says all things live by the spirit (POWER) of God- yet God's spirit bears witness to OUR spirit (power) when we are chosen to rule with Christ- so there is our body (1) with our persona (2) kept alive by God's spirit (3) which, together is our soul. By coming to the Earth as a man to bear Jehovah's Messages, Jesus became the greatest of ALL God's Messengers (angels). I have no idea what 'parts' you refer to; his persona was transfered from a spirit body to one of flesh.
Christians who are faithful make mistakes, too- NONE are flawless.