Not surprising considering there's a number of them coming straight out of Big Bash with the flat as wickets and non-swinging balls, to a lively green Hobart deck and a hooping pink ball. So while the returns aren't great, it's one innings, and you've still got to take into account their first class returns over the past season and a bit (and while Renshaw has had a lean start to the Shield season, he absolutely piled on the runs in County cricket).
Apart from Wade & Maxwell (who look to be on the black list now), I'm still not sure how Patterson is never mentioned in selection talks, and he just keeps plugging along with pretty good shield returns.