So this gets to what I was discussing.
Arcane research paper (http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0116046#s2) but here is what it shows...
Closest correlation in voting between M5S and SEL which includes PD "dissidents". (close correlation of PD/FI reflecting their coalition government, FI own center-right dissidents Alternativa Popolare now Civica Popolare formally within PD electoral bloc)
So re-inclusion of PD-dissidents now component in SEL would not hugely shift policy of M5S-PD coalition as
M5S already votes closest to SEL, while re-integrating those dissidents would re-enforce PD weight in coalition.
(and increase the persuasion of their political stance to M5S, re: negotiations for policy)
Charts unfortunately don't distinguish ex-PD dissidents from other components of SEL.
OFC besides not being necessary for majority, that runs contra to maintenance of Renzi policy without Renzi.
In other news, Lega announced openness to M5S coalition which is other majority scenario if PD refuses.
