You remember Hezekiah, king of Israel, who was sick & ready to die but was given an extra 15 years of life?
After him came Manasseh, the most evil king of Israel* who 'filled Jerusalem with blood from end to end', and assured the destruction of Israel.
He was 12 years old when he became king, therefore was born to Hezekiah after he recovered. If Hezekiah had died sooner then Manasseh would never have been born.
Welcome to the 'what if' game. :-p
*edit - I note that he was king of Judah - not Israel. Pillock. :p