I honestly don't get the whole attitude that suddenly walcott is the key for them... He is much quicker than any player we could put in there, so if it comes down to a foot race he will win it. If JT was available and fully fit i would go JT and Ivan without a shadow of a doubt. But without him, Ivan and cahill is the next best and imo that is what we should play and not play Luiz at CB just because he is quicker than Cahill. If Luiz is halfway down the pitch in midfield it makes no difference how quick he is. Luiz can play in midfield a lot better than in defence. If i was playing fifa then i would 100% agree with you but for me our best defence available is our best defence and is what we should play.