Fair enough, .8 runs it is. (I could argue baseball isn't linear, but let's just go with the basics.)
Now I don't have Dewan's stats for 05/06 with me, but I did check The Hardball Times RZR, which shows Omar the far better defensive player, but by only 85 plays in the zone those three season (Multiply Omar's RZR by Jhonny's chances in zone, subtract Jhonny's converted outs). Jhonny seems to make more OOZ plays so if we credit those 21 extra out, we get 64 plays. That's about 52 runs over three seasons. Even if we ignore the OOZ plays, we get 68 runs and thus Jhonny is an equivalent player to Omar.
I believe Dewan's Plus/Minus is much harsher on Jhonny than any other system. Most had Jhonny as a good defender in 05, but he was negative according to Dewan's system.
No matter how you cut it, declining to resign Omar was the correct decision.
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