You didn't answer my question: What do you think Jesus meant with these words:The OT saints are going to be in the Kingdom of God, so why wouldn't John the Baptist also be in the Kingdom of God?
...
Luke 7:28 I tell you, among those born of women there is no one greater than John, but a lesser person in the Kingdom of God is greater than he is.
... or this more explicit passage:
Matt. 11:11 Truly I say to you, among those born of women, there has not been raised up anyone greater than John the Baptist, but a lesser person in the Kingdom of the heavens is greater than he is. 12 From the days of John the Baptist until now, the Kingdom of the heavens is the goal toward which men press, and those pressing forward are seizing it. 13 For all, the Prophets and the Law, prophesied until John
...????
Before answering, just hear Jesus. Try to understand Jesus' words instead of trying to read your own ideas without understanding Jesus' teachings.
PS: That's the big mistake of most believers; they think they better trust what their own mind says than what they read in the Bible. Most of them do that because they think God talks to them in their own head, not with his written word.