I see where you're coming from, but if you compare David Luiz to Alex.... Alex and Terry are two very similar defenders, neither of which are a Carvalho-esque player in truth, and that's why... in recent games, our form has not been up to scratch. If you look at David Luiz. He's a proven sweeper... a centre back with pace, someone who is brave enough to go into tackles. Carvalho was like for many years, alongside Terry, and our defence was rock solid, and we won 3 titles because of it. You also need to take into account that JT's back problems are still around, and whenever he gets a tweak, or a knock that affects this, he could be out for some time, and you need players like Ivanovic and Luiz (great partnership I might add) to fill his gap. And I only say Ivanovic because his form is immaculate, and... unfortunately for Alex... his injury will prove dividends! And that's partially what I'm nervous about because I really like Alex as a player.