After the lottery yesterday I've been taking a deep dive and looking into prospects. A ton of the prospects are very skinny dudes with "high potential ceilings".

I understand that shooting has correlates with free throw percentage but how does one look at a rookie and assume they can add mass to their frame, develop ball handling, etc. The two most extreme rookie situations I'll use are Lebron and Giannis. Lebron coming out of high school was super athletic and was already a grown man, his 3 point shooting was dog crap when he was younger but it's now pretty reliable. Giannis is way on the other side of the spectrum, his shooting was at its best his rookie year but he's put on a ton of mass.

So my question is when you're evaluating a prospect based on potential how do you determine they have potential for ball handling, size, defense, etc?