what the heck are my Communion Slaves doing?

[Zooko]

More communion questions:

I have six mages. (I hope my enemies from the Argitoth MP game aren't reading this thread.)

I could make one be Communion Master and five Communion Slaves. This wouldn't give the master any more magic path boost than four Slaves, but it would spread the fatigue out a bit more.

Or I could make one be Master, four Slaves, and one neither.

Or I could make two Masters and four Slaves. Now if I did that, would each Master get a +1 boost and spread the fatigue among two Slaves each, or would each one get a +2 boost, and spread the fatigue among all four slaves?