What do you think determines the beginning of the present dispensation? I will tell you why I think that it began at Acts 13. Here are three quotes from the pen of Paul where he speaks of a "dispensation" that has been committed or given to him:
"If ye have heard of the dispensation of the grace of God which is given me toward you" (Eph. 3:2).
"Whereof I am made a minister, according to the dispensation of God which is given to me for you, to fulfil the word of God" (Col.1:25).
"...a dispensation of the gospel is committed unto me" (1 Cor.9:17).
The "dispensation" which was committed to Paul is in regard to "God's grace", a "ministry", and a "gospel." Here Paul sums up his dispensational responsibility:
"But none of these things move me, neither count I my life dear unto myself, so that I might finish my course with joy, and the ministry, which I have received of the Lord Jesus, to testify the gospel of the grace of God" (Acts 20: 24).
There can be no doubt whatsoever that the event which marks the beginning of the "dispensation of grace" is the preaching of the "gospel of grace." And that gospel was not preached until Acts 13:46-49.
What proof can either you or Shawn give that it began at Acts 9?