[2:19 PM] TheKillerNacho:
As suggested in suggestions , the following change will be implemented next patch: 
Previously, HighlySkilled had no synergy with Blue Mages whatsoever. Now, when getting a Blue Mage while using the HighlySkilled skill, your chances at a “special” Blue Magic set (defined as either Bio, Limit, Lucavi Skill, Mighty Sword, Robosnake Skill, Byblos, or Demon Skill) is improved. This is accomplished via a 50% reroll each time a non-special set is selected (and this can reroll repeatedly). Conversely, if one obtains a Blue Mage when excluding HighlySkilled, the chances of rolling a special set is instead decreased via the same method. As HighlySkilled is included with Raid Bosses, Raid Bosses are affected as well (and units rolled excluding the RaidBoss hidden skill receive reduced special set odds).