There's a reason why hokage minato costs 20k+ while jonin costs 12-15k.

Hokage gives the resistance buff to your whole lineup, owns higher basic stats and scales up higher than jonin and his special attack can't be avoided.

Moreover he selfbuffs way easierly than jonin.

The only advantage of jonin is the fact he may get mystery available every round.

About arena, if shisui teams are your problem you may just use *y harem jutsu and sand dust instead of dance of impetus and multi shadowclone jutsu.

Since you want to use jonin minato, by staying wind, you may actually get kisame samehada. Get madara 5th kage summit only if you plan do switch to fire or water main.