Sorry I misread or you edited, but I thought you said the next time the PG's should score 47(27) points. That's obviously not the case, but yes the PG's could score 27 points on 17 shots, probably with the same chance as the 6p on 17. If all factors and outcomes stay the same and just that 1 outcome is overturned, yes there would be a big difference in score, but that's perfectly possible too. It's just less and less likely that all the factors are in favor of one team to cause a blowout if the teams are about equal in strength. I think there's so many statistics that are calculated that it's hard to have them all line up and cause a huge anomoly. Maybe there's a limiter in the GE to preven that from happening, I don't know. I do know that players can have bad games.
Even if the PP100 aren't entirely accurate, I don't think it differs immensely from what it should be. The changes in the GE aren't that drastic, so why would the PP100 calculations change drastically? Even if it's 10% difference and the PG's would have 90 PP100, the 6p on 17s is still a pretty big outlier.