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The reason behind the two F Rank Familiars created through Synthesis was because the [Familiar Synthesis: Lv1] Skill had already reached Level 2. Now, I can possibly create E Rank Familiars using Synthesis, but because I lack E Rank Familiars, I can't do this yet. The other skills are getting closer to level 3 already, so I might be able to upgrade some of my F Rank Familiars into E Rank, as I've accumulated a lot of their respective Spirit Orbs. Synthesis Familiars are hard to make though, as I can only produce their cards by fusing the respective cards that create them, therefore, they usually take three times as much MP as the others, this is why I've only summoned 1 Shell and 3 Falcos for now, more than this would be destroying my daily MP.