If, and it's a big if, some trading partner was willing to give up one of its starting pitchers -- and of course which starter would be a huge factor -- and if their need was one of the Reds' regulars, the loss of which one of the starting 8 Reds would have the least negative impact upon the team's performance?
For the sake of simplicity, consider just last season's OBP + SLG:
Ken Griffey Jr. -- 0.946
Adam Dunn -- 0.927
Javier Valentín -- 0.883
Felipe López -- 0.838
Jason LaRue -- 0.806
Wily Mo Peña -- 0.796
Chris Denorfia -- 0.785
Austin Kearns -- 0.785
Rich Aurilia -- 0.782
Edwin Encarnación -- 0.744
Ryan Freel -- 0.743
Jacob Cruz -- 0.734
Tony Womack -- 0.556
At first glance, looking at the list from the top down, it looks like Valentin was more productive on offense than was LaRue, but then one must recognize Jason's superiority over Javier on defense.
Next we see Denorfia (with 10 times fewer AB than Kearns) tied with Austin in OPS. Could Chris and/or Cruz, McCracken, Rhodes, Wise supplant "Ears" if the Reds got the right pitcher in return?
Farther down the list is Aurilia's OPS topping that of both Freel and Womack, theoretically making those latter two possible trade bait.
Little of the foregoing considers defense, speed, age, or whether or not last season was typical of future performance, but who can replace whom should be considered when it comes time to trade a position guy for pitching.
Isn't there a quantative measure of player replacement value that has been discussed on this board in the past? Could that be useful in trade planning?