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Similarly, if a chess move is the best one, if it raises your winning chances from 48% to 52%, then you play it every time in the same situation. (That's one of the compasses in the chaos: would I play this move every game?)
If the ROI on Saunders and on Tui make each of them the best choice at their position, then you go with both of them. True dat.
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Stars & Scrubs gives fluidity. If the A's put three young guys in there, and two flop, they swap them out real quick. It's when you buy a Curtis Granderson that you ossify a position for better or for worse.