How 'bout instead of using highly subjective terms to describe his value, and highly subjective terms to explain his abilities, why don't you guys start out by stating how many runs he is worth? How many runs do you think he is saves beyond an average center fielder over 150 or 160 games? It seems to me he is at least +5, but no more than +15 (thats true talent, his recorded performance could vary by 5 runs or more). That means a maximum of 1 win between the most optimistic and pessimistic views. Is that a big deal? Is that the difference between a solid player and a star? No and no. Most likely you two are really not that far apart which would make arguing over whether he has incredible instincts or just really good instincts a waste of time. He's probably around a 3-win player as is, and whether or not he is worth more than that hinges on whether his bat takes a leap forward, not how you parse his defense.