Concluded, guren would have been able to beat mei, sakura and tsunade. Guren is therefore one of the strongest kunoichi despite being a filler character.
Isnt lava style just using fire style and earth style together, combining it. It could be justing the adding of fire style to melt the earth style thus creating lava. Also, Mei used it to seal up a wall during the fight with sasuke, the lava turned to rock after awhile, cooling down, so thus...
I mean if guren were to fight mei or konan. Guren could beat them, not by using feats to gage their abilities.
Mei cant do anything to beat guren since guren can crystallize lava and other liquid bases, turning them to her own weapons and thats pretty much all mei can do since all her attacks...
Guren can beat sasori kakuzu zetsu konan deidara kisame hidan
sasori: him and his puppets are all wood, crystallized easy. Iron sand, crystallize and use against him.
Kakuzu:Guren can just crystallize him and his hearts since his skin turning to earth defense is useless aganist crystal style...