I'm not saying they beat all of them in 1v1. i'm saying, kakashi is higher in the top than any kage, and that gai is higher in the top that any kage.

So, i'm saying, in a 1v1 raikage vs kakashi, kakashi looses, BUT, if you rank them, kakashi is higher in the top.

Gai looses in a 1v1 against gaara, BUT, if you rank them, gai is higher in the top.

Look how they're fighting obito, madara and the juubi (jubii = 100 PS and 10000 mokuton susano clones)
They have proven to be very strong (both kage material)

So my top list would be:

1-Kabuto (with edo tensei)
2- Edo madara
3- Obito
4- Hashirama
5- Nagato
6- Naruto
7- Sasuke
8- Itachi
9- Minato
10- Bee
11- Orochomaru
12- Kakashi
13- Gai
14 -3rd raikage
15- A

iF we're saying that A is the strongest kage, (IMO he is) , then if kakashi and gai are higher than him in the top, then they're higher than all of the current kages