How high does Zach LaVine actually jump? His best dunks put him around 43 inches, give or take an inch. He covers so much ground off one foot that the distance can fool you. A free-throw-line dunk tells you he can fly, but it is not the easiest clip to use when you are trying to judge straight-up height.
The jumps I would use
LaVine has some ridiculous distance dunks, especially in the dunk contest. The useful clips for this question are the ones where you can see how high his head gets relative to the rim. He is listed around six-foot-six. In his highest-looking jumps, he gets close enough to rim level to make a low-40s vertical look too conservative. There is no clear reason to call it 46 or 48. Around 43 is where I would put him.
There is some guesswork here. He might have had a better jump that was never filmed from a useful angle. A head tilted forward can make one frame misleading, and a contest dunk is not the same test as touching a measuring device. That is why the estimate has about an inch of room on either side.
What the 2014 combine measured
I say 46 inches in the TikTok, but the Suns' 2014 draft profile lists LaVine's combine vertical at 41.5 inches. A later Timberwolves article mentions 46 inches without calling it his combine mark. The two reports should not be treated as the same test.
That does not automatically mean the film estimate has to be 41.5. The combine was in 2014, and I am looking at jumps from a different point in his career, with different approaches and a ball involved. It does mean we need to keep the two numbers straight: 41.5 measured at that combine; around 43 is my estimate from footage.
The same video also gets into Aaron Gordon, Victor Wembanyama and Russell Westbrook. Their estimates are in the NBA vertical table, with the full clip. The games versus warmups breakdown gets at another reason a player's best dunk and best tested jump may not be the same attempt.