Scott Grix is a reasonable player but you would want to sign a player like him as a young man. Jordan Turner, for example, is still a young man and can be coached into being a better player. Thus, on the face of it, a good signing.
Grix also has that utility label, which he would want to get rid of. You would be hard pushed to say which one position he was good enough to make his own.
In the end if we sign old men then they need to be tried and tested at the highest level in his established position. This is why people had a problem with Hohaia being signed as a stand off/scrum half.