Remember - i said this was all conjecture.

From what we have seen of Deidara, Deidara seemed weak to close range combat (his defenses are weak) and relied on long range attacks (homing missiles). But then again we haven't seen deidara's true potential.

Kakashi/Gai are excellent at close range combat from what we have seen. But then again Kakashi and Gai are stronger since we last saw them and we don't really know what Gai is capable of.