You are rightWe'll have to disagree on this one. I do believe that initially the Gospel of the Kingdom was preached only to the Jews, while the Law remained in effect. But once Christ rose from the dead, the Gospel of the Kingdom was given to the whole world.
I reread what you said....yes Jesus was only sent to the lost sheep of Israel....the commandments progressed to the twelve...in Matthew 24:14 they were commanded to go to the world with the gospel of the kingdom. The gospel of the kingdom was that the kingdom on earth was coming for Israel and the Gentiles would be blessed through Israel.