More group confusion

Alrite, here's an email I received (suitably disguised for identities).

Dear Professor,

We had already formed a 6 member team (with all engineers and none having taken Marketing Services).
As advised in the blog, we have added one more member who’s not from engineering background and has also taken MKSV.

Just wanted to check whether that is OK.

Best Regards,
xyz

And here's my reply:

Hi xyz,

6 is the number that groups should go with. Pls do not add a 7th member yet.

The plan is that should folk get left over after group formation is done, I’ll randomly assign them as the 7th member to some group.

Hope that clarifies matters.

Sudhir