Southampton's system uses one real striker with Ramirez behind, Lambert hasn't been injured or suspended and has scored 8 league goals. In the summer how much quality did we have in the striking department beyond Lambert to work at Premier League level?
Had we not signed Rodriguez or Mayuka, who would you suggest play if Lambert were to be injured/suspended?
To criticise Rodriguez for only scoring 2 goals is daft, he has been used out on the left and come on for brief cameos. Rarely has he been played as a striker. As I said, he is 7 years younger than Lambert, he is his replacement this season in case of injury/suspension etc and in the long term can be groomed to be his successor.