THEORIES SCHMEORIES this is what WILL happen.
Hibari and Squalo are gonna fight Kikyo.
And they're gonna beat the shit out of him.
Two pages in he'll be flat on the ground and they'll be raping him with their tonfas and sword.
Squalo's going to get like a kajillion CMOA's.
And then next guy that comes up is gonna be the missing Funeral Wreath. So all the pacifiers (the ones that Uni brought plus Colonello's that Tsuna and co have), Vongola rings, and Mare rings will be in the same place.
The universe will then implode, and spit everyone out in different realities. Tsuna an' the Gang will be lucky enough to end up in their own time thanks to the amazing transporter thing. The Millefiore will be dumped somewhere shitty like the moon.
And it's gonna be awesome.