It's not quite that simple. In the link test to multiple VCs the Medusa tries to send data to ALL VCs in a fair and equal manner. It will be forming a new group every TDD. This group will have 4, 5 or 6 members in the case you have shown but the VCs making that group will be different every TDD. The number of permutations of 4 out of 99 is
P(n,r)=n!/(n-r)!, where n=99 and r=4. This works out to 90345024 possible sets. Now, of course, not all these sets will be valid because medusa needs at least 12 degrees of angular separation between each member of the set. Even so there will be a large number of possible combinations that will be valid. When passing user traffic, medusa calculates which VCs have data waiting to be sent and which of these can be best combined in groups to maximise the throughput of the system as a whole.
We are working on a new set of MUMIMO statistics data which will help users better visualise how it is performing on a live system.
With your 99 VCs being able to be grouped so that medusa can transmit to 4-6 VCs in the same slot you should get a good increase in traffic throughput compared to a non-medusa 450.