Tried it last night with an account not linked to the master or slaves.

Works fine. As long as the master toon is in the group with the booster, they all get the RAF experience. Gained 4 levels doing ZF a few times. The only problem is that with a 5-team you have to rotate them in and out to try and keep them within the 4-level limit. Going to slowly summon them all over the Scholo and try there tonight.

To be clear on this: the booster account is not linked in ANY way to the master or slaves, except that it's in my name of course Looks like I'll be buying 4 x BC tomorrow.