Why does the author feel that whites owe King the greatest debt?

Whites owe him the most because he made the U.S. the leader of the free world without any doubts or disbeliefs.

Was King "the right man at the right time"?

He was the right man at the right time because he was extremely courageous, he stood strong for his beliefs, and was a minister which gave him influence in the african american church which was one of the most powerful black institutions.

Would King be upset with the current use of his most often quoted line? Why or why not?

I don't think King would be upset as long as they were using it to help something they strongly believed in and would fight for.