I limited the hypothetical to offense because it was formed under the original premise that Sano and his already assumed inferior defense (and his superior bat) would be at 3B, if he failed, Nunez would likely be a defensive upgrade. And looking at RC+, OPS, OPS+, oWAR, BaseRuns, basically every offensive category, Nunez was at least better than Plouffe was last year, which was a wholly ordinary year for Plouffe. And again, the idea isn't that Nunez would replace Plouffe, it's that Sano would replace Plouffe and Nunez/Escobar/Polanco are the contingency plan. I think hedging ones contingency plans is about as conservative and wary as you can get in baseball.