The Vongola Takes on The Shichibukai
Tsuna is Replaced By Xanxus & Byakuran
all of the shichibukai
For Starters the Vongola's are Good but not that good.
Yamamoto rains only works on those who use the dying will flame; none of the shichibukai has a dying will flame.
Tsuna is not faster than kuma or gecko moria simply because their movement are instantaneous. For Rokudo to posses if first hast to injure the target with his trident and then shoot them with a possession bullet in addition to having a strong will that can over power the targets will.
I don't know a thing about this Vongola Familia but...
If Law's hax is useless
If Doflamingo's hax is useless (even though we have not seen anything of what he can really do)
If Kuma's hax is useless
If Hancock's hax is useless
If Mihawk's mountain lvl + swordsmanship is useless (even though we have yet to see him in an all out battle showcasing his true ability)
Then this Vongola Familia take the victory.