To be honest, getting to 6th path on the Arena is extremely difficult, I have no idea why are we required to get the rank designed so only a handful of people would be able to reach it, to even get any rewards from Arena.

That being said, even disregarding the fact how hard it is to get there through fights, you still will most likely not be able to get it because of either :
a) You are on a new server, so there is no cross server arena, and nobody to fight with.
b) You are on an older server, and there is cross server arena, which means that your opponents will be so much stronger than you, you have no chance of beating them.

On my server only one person even got to the 6th path, and it was like in the same week this system was added. So I'd say for some servers it's probably the only way to actually reach it.