If your UZR is 15, 10 and 5 over a 3 year period, that is going to add up to 30 runs, or 10/year. If your offensive Runs are 30, 25, and 20, that is going to add up to 75 runs, or 25/year. I don't see how you are going to get anything but 35 runs per year when you add those up in any way you choose. If you think that 3 years of UZR is worthless and inaccurate, then thats a completely different story. If you think that defense is improperly weighted, that's a different story as well.