Belisle A Lock for Reds Rotation?

Many people have been constantly saying Reds starter Matt Belisle is a lock along with Harang and Arroyo for a spot in the Reds rotation next year. I ask why? Belisle has never truely proven he has what it takes to be a consistent major league starter, and with such great young talent, I do not think Belisle is a "lock". If in Spring Training Volquez, Bailey, Cueto, Maloney can prove that they are ready to compete and contribute at the major league level why could they not take Belisle's spot. If Belisle is removed from the rotation, however, I do think he could still contribute from the 'pen. But just giving him a spot just because of his experience and not his performance should not be tolerated.