There is one thing that was obvious when watching the present and future first basemen today at Pirate City -- defense is going to be a big concern. That would be expected with a catcher who is converting to a position he has barely played, and a former outfielder starting his second season at the position.
I posted video today of both first basemen taking ground balls and picking balls out of the dirt during their infield drills. These come with a few disclaimers. For one, it's January 11th. The season is almost three months away, so there's plenty of time for practice and development.