There's still unnecessary movement in nearly everything Jake throws, even his jab was telegraphed. Speaking of his jab, there were also instances where he moved his right hand away from his face when he threw it, leaving himself wide open for a counter. One of the reasons Jake doesn't have very good stamina is probably that he wastes so much of it overcommitting to his punches. Missing punches wears you out, and when you're putting everything in them and missing by miles, it takes a serious toll on you. I think I remember Tim Bradley once saying that he'd train a powerful boxer like they have no power, so that they wouldn't use it as a crutch. To me, Jake looked like his power took his focus away from his fundamentals and he paid the price.
As for what he did right, his sense of timing was alright when he wasn't trying to take Fury's head off. Some of his jabs snapped Fury's head back and he landed some good counter right hands; the jab that dropped Fury was magnificent, but that kinda timing was few and far between. When he wasn't trying to land home run shots, Jake could put together decent combinations. If he straightens his right hands and tightens his hooks, he'd have more energy left in his reserves to chain punches together more often. He showed a big heart good chin too; Dude was exhausted, eating lefts and rights, left, right and center. Last time a boxer ate like that was when Prince Nasim retired.
He's not bad for a novice, but these are things that I've noticed throughout his career, that haven't been addressed fully. Is he a better fighter now than he was starting out? Absolutely, but his technique shouldn't be this sloppy. You'd think with all this talk about him having an amazing team and so much money behind him, that he'd have more skill than that. Instead, he was in his biggest fight doing two-man shadowboxing with Fury at times.