Our Lord breathed on them to empower them and to qualify them for the work He sent them to do, this breathing on them and the words that attended it, were a symbol, pledge, and confirmation, of what they were to receive on the day of Pentecost: hence it appears, that it is the Spirit of God, who, by his gifts and grace, makes and qualifies men to be ministers of the Gospel.
That is all conjectured reasoning.
In, John 20:22, Jesus said receive the Holy Spirit and that is exactly what the received [take note that there was no fanfare when it happened]. That account only speaks the indwelling of the Disciples. Even Jesus only had the indwelling until He was Baptized with the Holy Spirit as evidenced by the Dove that lighted on Him:
"And the Holy Ghost descended in a bodily shape like a dove *upon him, and a voice came from heaven, which said, Thou art my beloved Son; in thee I am well pleased." Luke 3:22 (KJV)
*Note
*upon Him as being the third manifestation of the Holy Spirit spoken of by Jesus, separate from the other two here:
"Even the Spirit of truth; whom the world cannot receive, because it seeth him not, neither knoweth him: but ye know him; for he dwelleth with you, and shall be in you." John 14:17 (KJV) The *
in you being a prerequisite for the *
upon to happen, Jesus being the example Luke 4:1.
So then am I correct in assuming the MADs (if you are one, I dunno) say that The Body of Christ began at Jn 20:22?
If it did, and it could have, what's the problem?