Actually in many setups it is worth checking gn, we're just so used to it being guaranteed town (which it isnt here). also, you are assuming everyone understood timpa was gn and thus wouldnt feel the need to investigate before hand, in which case he wouldnt survive since that would extend to mafiamembers. Also regular info roles may not be important but other than psion are more protown than not.
And shock did play different, it took him a while to figure out that not being as irratating as usual actually gave him away and then he abandoned the rolehunt for no reason, also I think he was even more ignorant of reason than before. Only 2 things stopping me from continously scumreading him were that he seemed at odds with anubis and that oa was also sorta scummy ... go figure.
Admittedly, i started pushing shock initially just because I needed a good target for oty when there was no info yet, but then he was also more subdued than usaul like he was facing a situation he wasnt used too.