I don't disagree about Fonte, he has definitely stepped up. But its extremely unlikely that he and Lovren will play in every game, injury and/or suspension could well mean that we have to rely on our backup, and I just don't see that we're anywhere near as good defensively with Hooiveld or Yoshida. If we did buy "another Lovren" then Fonte would make way and become the first reserve. For now though you're entirely right, Fonte has done a brilliant job. As for reserve GK, I reckon there's plenty of keepers who would move despite being sat on the bench most weeks. Can't say I'd say the same for a left back though. I reckon we'd perhaps be better trying to find a left footed Ivanovic, someone who is equally comfortable at left back as at centre back. They don't just grow on trees though...