Can't comment on espanyol but he hardly ever played two up front at Southampton when I saw them.
They only had lambert as centre forward there plus osvaldo briefly
Rodriguez played as a wide forward in the mould GB has described many times in the past
I'm happy to be correctd but I certainly saw them as a 4-2-3-1 side last season
Rodriguez seemed to me to be the furthest forward of all at Southampton. And IMO was definately up there as a pair with Lambert.