"I have Minato jonin and Shisui and all other ninjas" It would be best if you can post your ninjas here.

Edo Itachi without a doubt, as he is best support right now. Will fit in any lineup.

8-10 = 1.2k refines

I wouldn't recommend using coupons on clothing at all. The only worth to buy was "Yes master!", but it costs a lot. And comparing to how much Training potions you can buy with those coupons, and how much it will increase power in comparison with a cloth, it's a waste. Unless you have maxed your Ninja Assist, but even then, it's a waste to buy clothes, as there are still better ways to use your coupons/ingots.

I encourage low-mid spenders to gather clothes only as free to play players, with freebies.