Hi there! I would recommend to get Naruto[Sage Mode] from the events .. In Sage Treasure, anytime from this moment, you may get him from free pulls .. Then, if you have enough budget coupons for buying him from the Treasure of the Sage then go for it, just make sure to buy it with the highest possible discount rate and that's 30% i think for Naruto[Sage Mode] .. In my situation, i gathered and collected his fragments from the previous events and now i'm short 27 fragments to recruit him and i'm planning to buy the remaining fragments from the Treasure of the Sage but, once again, my coupons are drained because of the Konoha Tree Event xD .. hahahahaha

Hi there! Yes, use Naruto[Sage Mode] as your damage dealer while your Roshi charging his +Ninjutsu boost for his Burning Ocean, you may put Roshi in front and take all the beatings, but you must support him well so he will not die before you get the devastating power of his Mystery Skill, if you put him in back, they you're missing his Full Potential to make you victorious in battles .. If you want to * with that ninjas you have then better to make your formation like this :

X - X - X

Sailor - X - Roshi

Earth - NarutoSM - NarutoSMClone

Hi there! Just like Zathroth said above .. Earth Mains provides Shield for Roshi, makes him to last long in receiving hits,and at the same time, increases his Ninjutsu and Defense(?) .. While on the other hand, with Water Main, she can go heal and heal and heal to keep Roshi alive while charging his Ninjutsu .. so its the matter of preference on what Main to use .. Maybe it depends on situation or mission too .. i don't know much but that's what i think