It is irelevant when a particular Gadol got married. The Shulchan Aruch itself allows one to delay: assuming one doesn’t have money for food and is not yitzro misgaber alav. So I’m not sure what your point is.
I spoke to Ostrov and asked him to explain his position to me and he was apparently unaware that age-gap + population-growth= Agunos exists throughout the world and is mentioned by academics (E.g., Prof. Sautmann of Brown University). He admitted to me that he’s not a math person, by which he meant that he really is in no position to understand or render and opinion on the crisis.
Yes, anyone who delays past nineteen unless he can fit into the Shulchan Aruch’s hetter is chayiv misa. He also won’t have techias hameisim.
Regarding having emunah, that’s fine. But this problem was caused by our bechira and by greedy people who have lucrative family businesses which make them reluctant to stop it.