Looking it up and not reading too deeply, this was the first paragraph about PRC that I noticed...
"2. It tells you what a pitcher’s absolute value was. No more messing around with replacement levels or whatnot; Pitching Runs Created are just like Runs Created for hitters. Yeah, you can put in a replacement level if you’d like, but there isn’t really a need to."
If that is true, you are misunderstanding PRC, oriole. It would say that in 205 Innings, Sheldon saved more runs than Ducey did in 286 innings, as it is an absolute value and not a rate... if you wanted to correlate it to RC/27, which would seem appropriate, you would turn it into PRC/9IP, and Sheldon would come out to ~2.01 with Ducey at ~1.42, assuming you calculated their PRC correctly (I don't know the formula).