He's smaller, less athletic, and less crafty/worse ball handler than Steph. Stating the obvious, nobody expects him to be. My point is, that's not the kiss of death, but I think he's limited to a shooter in the NBA, with the potential to become a crafty shooter due to his IQ and feel. You could do a lot worse for a 12th man. He has great confidence and he's definitely improving. I'm sure working out with his brother is one of the instances where it really does have a tangible effect on his game. They're made of the same material, even if Steph is on a level that Seth will never sniff.