Hi there. This is my f2p roshi setup. avarage 50-60 hit combo round 1 unless its vs hinata/neji team or an immobile / chaos team.
https://gyazo.com/929b1f9faee2e41347e46b4ba1f886f3
https://gyazo.com/7058eedcafca3c4009884b5206483f64

I'm kinda low bp but i defeat people with 28-30k bp in my own server & in sage battlefield.

Why i chose to line up like this?
1/ Roshi upfront with near 4k shield & 8k hp. He will soak up alot. He has +25% ninjutsu and -5%resist. I had +25% health but this seems to work just as good if not better with the burst in round 1.
2/ Earth main will shield whoever is needed for 1.6k in round 1 with standards. He is positioned there because otherwise people in middle will also attack roshi. Roshi is pretty squishy and he might just die. Earth main is tanky from itself. 25% resistance -5% attack. Might go for 25% health up to the user
3/ Yagura i usualy steal a healer or someone of 10 combo. I might steal light main / guy for lifesteal if needed. Ofc yagura in back because he is weak.
4/ earth main mystery i would use vs nearly every non hinata / neji team round 1 . after killer bee's 1 st attack so i will 100% sure get 30 hit combo (use killer bee mystery on himself)
5/ Killer bee just as last on the bottom for the same reason i put my main in the middle. Soak up a few hits if they have units on bottom line.

This way u spread damage all over ur team. Yes ur team will all be "lower" hp in general. But the point of this team is to just DESTROY ur opponent round 1 & use roshi round 2 start . This usualy ends up in killing multiple enemy's. Once u get to the point with higher HP like you. It is still pretty viable but you'd probably want ur earth main infront of roshi or atleast steel body. I guess with the lineup you are talking about it would be good to try the same as me. Spread out the damage

Yagura is a must due to him being able to steal someone for life steal , stealing someone for their chase , & doing a 15 hit chase himself. Atleast for my team ^^ I assume sailor sakura would work if u want roshi to stack on his own buffs. But you'd be missing out on his chase etc