Claudius The Rice signing makes a lot of sense in light of his history as a young defender.
Arteta seems obsessed by the idea that having a bunch of guys who can play at a very high level across at least two of fullback, centre half and pivot is both more tactically flexible and also gives you cheaper cover for injury.
To be fair to him it's a pretty cool thing to be obsessed by, but we'd better not drop any points here.