Well, depends on why they are there. If the main point isn't to affect EU legislation but to use it as pulpit for a domestic audience, then the symbolic value of group affiliation is more important then practical advantages. And for M5* independence is symbolic.

M5* could also form the core of a new group. For that they need 8 more MEPs from 6 different countries. Like tories and UKIP has done. Perhaps Grillo was taking notes on how a group works and how UKIPs offers to newcomers are structured...

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