A. He is a freshman and was co mvp of the elite 11 qb camp and was the most accurate qb there.
B. Who says he won't have the tallest receivers next year?
9 returning receivers are over 6 foot 2. Five are over 6 foot 3. 3 are over 6 foot 4.
Matthews is definitely a big loss but even looking at this year blackmon (6 foot 2), pearson (6 foot tall), juergens (5 foot 10), and Henderson (6 foot 1) all had allot catches and yards.
Plus the running backs caught some balls.
It's not like he only passed to tall guys. Mangum spreads the ball around. Happened to have 3 super tall dudes, two of them seniors, and he took advantage of that sometimes. Him using his tall weapons doesn't mean he can't throw to shorter guys. Taking advantage of the defense with the weapons at your disposal is what any qb should do.
So in answer to your question.... Yes I think mangum will be a very good qb with whatever body type his receivers have