It's as the title says, since two characters Bankai are unknown this is a purely Shikai only fight. Otherwise the combatants have full knowledge and full intent to kill.
Gin would win, his blade shinsou is based on speed while komamura has little to no speed at all. The time it takes for komamura to swing his blade, Gin would've impaled him.
Kamamura's tengen is too slow and bulky Gin and Rose wld so hurt him, Love's shikai is also bulky and with Gin's reach it wldn't be a good match for him and Kinshira is also hax so team 3/Gin-Rose takes this.
I agree that gin and rose take this but some of you underestimate love and his ability like come on he has a flaming spike club that's freakin huge for a shikai. His bankai should be pretty crazy as well.