I have to say that Fulham was just really, really bad. That's not to say Saints weren't good, because we were. But we were also good against Swansea, and good against Man U. Different lineup each time. We weren't quite as dominant but those teams also didn't just utterly roll over like Fulham did.
So I don't think we have to play the same team just because we looked good against Fulham. I'm not opposed to using the same lineup, either. But I don't like being locked into that way of thinking that there's one setup that is best or being afraid to make changes.
It's a long season, and we're going to need to rotate some people around, and we have some young players to develop, and maybe other young players we don't want to work too hard. We should have confidence that we can make a few substitutions and still play just as well. If there's a particular reason why Rodriguez might be better suited for Stoke or Wanyama is truly indispensable vs Cork, then fine.
But keep the lineup unchanged or change it based on tactics, not just because we played well in a particular match. We should EXPECT to play well.