I love this game, but after I thought I had completed it, I discovered that I have to do all the side missions in order to complete the game fully. I'm fine with that, as I enjoy battling scions, but many of them (like Gilgamesh) are very high levels, and my team don't stand a chance against him, and a couple of others. I have my original 5 members at levels 54 & 53 (except penelo), but my espers are often fairly lower leveled. (the other 4 members are around level 45). Are the esper levels calculated through some sorta average? And, if so, which levels are best for EXP grinding? I assume I'm stuck to endless melees until I have enough levels to hold my own against the scions. Any help would be much appreciated.