As much as Ryan Grant was maligned on this forum, he was a dependable, not flashy rb, who was a ble to the job that was aked of him.
Coaches are hoping Starks can be that guy. They also have to be ready to go to plan B if they find he can't carry the load.
Starks has shown flashes of real talent, but if he can't sustain the level of play expected of him, then it's better to find out now, early in TC, than to wait till the season begins and have him not be able to do the job.
I was addicted to The Hokey Pokey, but I turned myself around!