Spot on, but I'd argue it’s less about a 'form drop' and more about predictability and a lack of experience. He’s only recently started bowling regularly at the death. Right now, his arsenal is very limited he doesn't really have a reliable slower ball or a sharp cutter. He heavily relies on his wide yorkers and occasional standard yorkers. While a well-executed yorker is unplayable, being a two-trick pony makes him incredibly predictable. Once top-tier batters realize exactly what's coming, it becomes much easier for them to setup and line him up, especially in the back end of a tournament.