Mag can hit open spot up threes at a good percentage. Knell can hit threes in a wider variety of ways at around the same good percentage. If you swapped their shot selection then Knell would have a much higher percentage than Mag.

That's what makes Curry the greatest three point shooter of all time. Other guys might shoot a higher percentage but can't do it in such a variety of ways.

If I had a guy shooting 60% from three I would give him a greener light until his percentage was closer to 40%.