What crucial statement by Jesus in Acts 9 do most people overlook?

The overlooked crucial statement is the Lord Jesus telling Ananias to arise, go to Straight Street, inquire at Judas's house for Saul of Tarsus, because Saul had seen a vision of Ananias coming to put his hand on him and restore his sight. This shows Jesus preparing Saul's conversion.

Les explains that Acts 9 contains the first of three accounts in Acts of Saul's conversion on the road to Damascus, a story most people have heard from pulpits and Sunday school. Yet he warns that too many totally overlook one of the crucial statements of the Lord Jesus Himself there, beginning at verse 11. After Saul's tremendous experience outside the city, the Lord speaks to Ananias, a Jew inside Damascus, telling him to arise, go into the street called Straight, and inquire in the house of Judas for one called Saul of Tarsus. The Lord adds that Saul has seen in a vision a man named Ananias coming in and putting his hand on him, that he might receive his sight. Les emphasizes that the Lord is preparing everything.

Acts 9:11

And the Lord said unto him, Arise, and go into the street which is called Straight, and enquire in the house of Judas for one called Saul, of Tarsus: for, behold, he prayeth,

What does it mean that God works the ends into the middle in Acts 9?

In Acts 9, it means God was working on both ends at once: dealing with Saul outside the city and with Ananias inside the city. He then brought the two together in the middle to accomplish His purpose, coordinating separate events so His plan moves forward.