I think there is a difference from being aggressive and better in the air. Just going to post some stats of potential centre backs and highlight the best stat per player etc.
Phil Jagielka:
Pass% - 74.5
Aerial duels won per game - 1.8
Tackles per game - 1.8
Interceptions per game - 2.1
Fouls - 0.4
Offsides won per game - 0.6
Clearances per game - 7.6
Blocked shots - 0.5
Gary Cahill:
Pass% - 81.7
Aerial duels won per game - 2.1
Tackles per game - 0.7
Interceptions per game - 1.2
Fouls - 1.2
Offsides won per game - 1
Clearances per game - 6.1
Blocked shots - 1.1
John Terry:
Pass% - 91.2
Aerial duels won per game - 1.1
Tackles per game - 1.4
Interceptions per game - 1.9
Fouls - 0.8
Offsides won per game - 0.7
Clearances per game - 5.4
Blocked shots - 1.1
Rio Ferdinand:
Pass% - 91.2
Aerial duels won per game - 1.3
Tackles per game - 1.2
Interceptions per game - 2.1
Fouls - 0.3
Offsides won per game - 0.4
Clearances per game - 7.2
Blocked shots - 0.5
Joeleon Lescott:
Pass% - 90
Aerial duels won per game - 1.1
Tackles per game - 1.1
Interceptions per game - 1.5
Fouls - 0.6
Offsides won per game - 0.5
Clearances per game - 5
Blocked shots - 0.9
Phill Jones:
Pass% - 84.2
Aerial duels won per game - 1.5
Tackles per game - 1.9
Interceptions per game - 1.6
Fouls - 0.6
Offsides won - 0.2
Clearances per game - 3.9
Blocked shots - 0.4
So as I basically said Cahill is much better in aerial battles than Cahill. Looking at the stats Rio Ferdinand has been the most impressive closely followed by Cahill and Jagielka. Like I said it all depends on how Hodgson will want to play but these stats give us something to look at and debate about surely.
The stats also tell you that Jags is better in the air than Terry, so stats don't give you the whole story. Watching the defenders, Jags is the most rounded of the lot. And Lescott is exceptional when played with Jags, and as a partnership they have the least flaws.