DataDomain partial Shelf ES30-60 4TB disk

Do anyone undergo a configuration of upgrading DD6300(expanded) that with 3 x ES30-45 (i.e. 3TB x 15 disks)?

In DDOS 6.1 admin guide or above, its stress that for model DD6300, partial shelf 50% could be allowed.

My questions is ... how about 75%, 80%... ?

Could max 180TB external capacity of DD6300, with ES30-45 x 3 (equal to 135TB),

accept 1 ES30-60 shelf with 4TB x 15 disks = 60 TB?

180 - 135 = 45, theoretically, the system couldn't accept 135+60 = 195 TB capacity, what would happen?

In advance, how about the licensing?

Many thanks.