And remember, positions are all about what you can defend.
Evans has a 6'11'' wingspan. Would have no problem covering 95% of small forwards, at least from a physical standpoint. Monty has to teach him the mental part.
But as far as measureables and athletic abilty, he is about as tall and long as Shabazz, but much quicker and stronger. So, if Shabazz was drafted as a SF and his profile is similar to guys like Caron Butler, then Tyreke can easily guard 3's