how?
The same thing has happened in their last 3 fights. Alex is simply not as skilled as Izzy is.
The last 3 fights Izzy has found Alex's chin first every time. He got embarrassed in Brazil to the point he was about to be TKO'd if not for a friendly hometown ref.
Same in New York, but for the pure luck of the bell.
Then when its nothing to save him. he gets KO'd
Izzy was still the favorite when he was 3-0 down, for this reason. (yes I know its beyond the mental capabilities of sherdoggers to consider details and nuances of a fight beyond the results), but the world saw Alex can't beat Izzy at 185. unless something strange is happening.
Izzy is already far far ahead of Alex, so whatever he Alex does is meaningless. He embarrassed him in front of audiences 3x. Mocked him with "here you can beat me, but we both know how it happened"
Alex was never really a MW anyway, he walked out taller and broader than Hill, LHW is his place - and I don't think Izzy can compete with him there, he doesn't have the size - so again its not relevant. But for MW, Alex is Izzys son.