OK, some stats I've just worked out for you:
** Arsenal are unbeaten this season when Mertesacker & Koscielny start together (but have only won 3 of the 7 games)
** Win % By Pairing:
TV & Kos (5) - 40%
Kos & Merts (7) - 43%
TV & Merts (22) - 50%
** Loss % By Pairing:
TV & Kos (5) - 40%
Kos & Merts (7) - 0%
TV & Merts (22) - 27%
** Arsenal are unbeaten this season when Mertesacker & Koscielny start together (but have only won 3 of the 7 games)
** Win % By Pairing:
TV & Kos (5) - 40%
Kos & Merts (7) - 43%
TV & Merts (22) - 50%
** Loss % By Pairing:
TV & Kos (5) - 40%
Kos & Merts (7) - 0%
TV & Merts (22) - 27%