Overthrow - under the laws its 5, but has always been applied as 6. This is a case of the evolution of the game getting ahead of the bylaws. 100 years ago batsmen wouldn't take on the fielder like they do these days. I expect this rule to be updated slightly to take the modern cricket into account, just like they did with grounding your bat and running past the stumps. (TV slow mo shows both feet off the ground in a normal running position, but now you can't be given run out anymore after they updated the law).
Superover - great spectacle, nothing wrong with using it to finish the game. The boundaries hit 2ndary tie-breaker is a bit annoying. I'd prefer wickets lost to be used if they want a tie-breaker. Ultimately I'd like to see a tie after the superover to simply be a tie. The rules for CWC19 were if both days of the final were washed out, the cup would be shared, so why not share it after a double-tie.
Umpires - I thought they were fairly poor. 4 decisions overturned from memory, and would have been another had NZ still had a review available for Ross Taylor.
Santner - massively under-bowled in the final. Not sure why. Perhaps it was punishment for ducking the last ball and not even trying to run a bye. You can look back on a game like this and think what if this and that, but for mine, this (not trying to score on the last ball) was the moment that should be questioned the most.
Re: overthrows. Surely umpires are duty bound to umpire to the laws of cricket. There should not be room for any interpretation. It's black and white. If they hadn't crossed when Guptill released the throw, it's 5, Stokes not on strike and a massive blunder by the umpires. If they had crossed, then it's 6, Stokes on strike and the umpires got it right. I still haven't seen any conclusive footage that shows whether they had crossed or not when Guptill released the throw.
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Cheers .... that's pretty clear cut.
It's good that Simon Taufell has acknowledged they got it wrong. I accept the umpires have a lot on their plate, but they also have the use of technology, which they failed to use. Credit to Kane Williamson and the other black caps for the way they have accepted this loss. I can't imagine the reaction if India were in New Zealands' shoes.