AVB's system does not require a specialist winger like Robben or Sanchez. A technically gifted forward,which I believe Sturridge is, can easily adapt to the 4-3-3 system as he's already shown in Bolton and pre-season and if you need further prove, look no further than Hulk with porto last season, he isn't a proper winger neither but adapted well to AVB's system. Because that would be a luxury purchase and given the new FFP rule, we need to spend wisely to comply with the FFP.