Not sure where you're getting these rankings. There are 2 sets of rankings, Ty Xanders' at Recruiting Rundown & Inside Lacrosse. FWIW, I put more stock in Xanders, as he gets to more events & takes time to provide extensive write-ups & reasoning behind his rankings.
In 2018, Xanders has Magnan at #2 & Cook at #71 while IL has Magnan at #23 in their top 50 & Cook unranked. I agree with the thinking that Cook could shoot up the rankings after another strong HS season & summer circuit but to suggest that he's currently top 10 is simply untrue. If we can bring in Austin Staats as a transfer in '18, he'd be the equivalent of a top 10 addition.
In 2019, JJ Levandowski is ranked #17 by Xanders & #2 by IL. Not sure where you're getting that we have the #1 '19?