I must say any time I have seen them play I thought they both worked together well. I would describe it as a John Terry Rio Ferdinand type partnership. O Dea is the talker and he also goes and meets the ball and wins the aerial duals. O' Cearuill is faster and likes to drop deep and sweep up behind O Dea. Probably a bit more comfortable on the ball too but O' Dea is a reall nuts and bolts type defender. Great temperment too to do it in the San Siro and not look out of place one bit.