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I think that by combining all 7 flames of the sky you get that 8th flame that Vindice have Tsuna might get a new flame more powerful if the Shimon were to give him all their 7 flames . That way the new flame would overpower Vindice's flame since the flames of the earth are really powerful . That's at least my prediction/theory
I think that you can only get the white flame or 8th flame if you are either undead or surpassed "being human". It must have certain consequences.