Curve of contact in shooter

[leolagos]

Our designing team is thinking in making a change in the typical wheel shooter by making the spining part of the shooter with the same curve of the ball (Something like the 973´s shooter in 2012). In our heads, the more points of contact with the ball and also the "walls" that will this shooter have, will be better but in contrast there are just a few robots with that kind of shooter.

We are wondering, what are your thoughts about using a mass with the shape of the ball (fuel)?