Unfortunately, it`s not all that simple.
I have a 2006 team with Bigbie (some hrs), Mohr (lots of homeruns) and Kapler (virtually no homeruns) as my back-ups in outfield (all can play the three fields). Up to now, Bigbie is always the one selected when Hal needs an of back-up, in any field. Not a single time did Hal choose any other two (except for pinch-hit....this is a pitcher`s league).
I even tried something: I put my regular cf---Hunter---off the lineup and left a blind spot at cf. Well, Hal chose Bigbie over Hunter!!!!
Strange fact, in all cases, Bigbie was placed second in the line-up. Perhaps Bigbie`s bunting ability (B) was the reason why he was chosen!!!