Where did 607 come from? Say what? Nelson Barbour is the one that applied the 70 years from the restoration of Jerusalem to the destruction. 537-607.
Prior to that, the chronology scholars believed the destruction was in 586 and that the 7 times ending or gentile times was independent of the destruction of Jerusalem. Daniel looked to the seventy years because he knew when it started, when Daniel was taken captive in 607. The 70 years ran from 607-537, but they started at the first captivity, not the destruction. That is what the pre Barbour scholars believed, which I accept.