wider or longer wave?
I think both is plausible.
No classify. (I am joking) <-
Assuming Enma doesn't shape back to normal, once Hiruzen reaches the air, in time.
I can see that happening, but... that wouldn't solve the elders' problem. They would still have to deal with a golden desert.
I think the Kazekage combo would be especially interesting, not because they bring different jutsus to the table, but because they're essencially the same with some minor differences. This would allow them to maximise all of their strenghts to the utmost level at the same time, and because they're so well rounded this would be even better.
For example, this would allow one to fully focus on the defense (making it extremely hard to surprise or reach them), while the other could charge forward w/o worrying about his back. Or if they choose to they can put everything they've got into the offense or defense w/o worrying about getting overwpowered.
The potencial is quite amazing imo.