I don't think there's anything wrong with what Guru did in the case of Evans. For his career coming into this season he averaged 35mpg with two years him playing 37mpg or more. Using PER36 to see what his numbers would be like if he played his usual minutes is perfectly valid in this case. Evans is not some scrub bench player that Guru is taking 10mpg and multiplying. People don't want to respond because they have already formed an opinion of Evans in their mind and want to be right. Any stats thrown out would be met with the same criticism because they don't want to believe they are wrong about Evans being terrible.
Anyone that looks at his stats fairly see that he is greatly struggling with jumpers but every other facet of his game is great. The numbers he is putting up with this ragtag thrown together team are solid in his limited minutes. The perception that he needs to be surrounded by great players to be good is just silly. I think the reason per36 is so valid in this argument is look at the numbers he would be averaging with regular minutes with this group. Of course people don't want to listen to that argument, it makes them look silly.