Pot, meet kettle.
Apparently you need to go back and watch that dunk, his right foot is on the line. Either way, he's right next to the basket. Think about the bounce that had Meyers shoot up draft boards. I just don't see the same degree with him, especially in game.
If his wingspan is truly that long, then you're right, he does have all the tools. But from what I've seen the past several years, most big men being taken in the first round are either highly skilled (Wendell Carter, Mo Bamba, etc.) or explosive leapers (Jaxson Hayes, Robert Williams), or both. I think Kofi has the base to develop the skill -- particularly shooting -- needed to become a first round pick, but I don't believe he has the requisite traits at the moment to garner first round (or even high second round) attention this year.
Now, notice I use the words think and believe...that is because these are opinions (gasp!). If you want information, go elsewhere.