I want to see him play some choppers in front and to the sides of him and throw on the run before I say that. Mike Lamb, for example, was excellent diving on "reaction plays" to the L/R but couldn't catch anything routine. But like you're saying, I don't expect him to suck at 3B at all.
As a nationals/expos fan and casual watcher of the Astros over the years, I have seen a lot of first worst in my day.