Would
Tessio seeing Sonny was running everything into the ground and pretty soon, there won't be one place in Brooklyn Tessio can hang his hat! switch sides to Barzini, to speed things up?
Tessio won't have to set Sonny up to be murdered as Tessio did with Michael. Sonny would do it all by himself!
What about
Clemenza? There won't be nothing left to build on....
1. Tessio can't wait switch sides
2. Clemenza hate that goddamn Barzini! form own Family
3. Tom take his wife, family, and mistress -- and move 'em all to Las Vegas.
4. Fredo banging cocktail waitresses two at a time!
5. Michael finish College, marry Kay live happily for a hundred years -- the family with Mama
6. Carlo and Connie -- well -- was -- well --