cough Mask of Scavenging cough
Greg did say about a day or two ago that getting the names through legal has a budget: Continuing G1's Story - #12 by RealGregF
I would think it comes down to the budget. The masks help advertise the sets, so part of the set budget would likely be able to go into the legal department for the names. (Especially if the character already had a name. This kind of makes sense; the Toa Mahri got masks as they already had names, while Barraki with new names did not get masks. The Makuta got masks and names, as the Toa Nuva already had both. Though that’s very speculative on my part.)