1
Is that the first thing that scouts look for, technically, is how mobile a catcher is while in his crouch. They want to know how explosively he can get onto a bunt, how easily he can get his CG over into an outside curve that bounces.
At Olivo's age, he's still lighter on his feet than most 26-year-old catchers. That's why the Mariners referred to it, no doubt, and it is an indicator that Olivo has good mileage left on the odometer.