Thank you for the chapter and the in depth analysis of the translation, as well as the the party comp/gameplay. I disagree on monk being a "killing machine". Due to the nature of etrian odyssey as a franchise, trying to spread your skill points out really hampers your effectiveness. Thus I prefer making monks solo healers.
For this particular party comp you can (kinda) breeze through the entire game just off the back of sovereign's passive healing. For me, I think the most important skill they have access to is ad nihlo to stop enemy buffs and inspire to remove party debuffs. The elemental skills on sovereign are a meme as far as I'm concerned. But I guess if you really want to get an elemental item drop??
For those of you playing at home: I recomend checking out the skill simulator:
https://www.intothelabyrinth.net/etrianodyssey3/skillsim/
This helps you plan out how to allocate skill points, but the MAIN benefit is telling you (mechanically) what every skill in the game does. For example: Ad nihlo scales from 130% to 240% damage based on skill level. (the platonic ideal of a damage skill deal 100% damage, and the damage formula for all damage skills is "the same" so it's easier to just compare the percent value of two skills to each other.)
(Technically the damage formulas for physical and magic skills is different, but it all boils down to the damage percentage modifying that formula. TL;DR: Bigger percentage is better. For more information, check out this let's play walkthrough that goes into all the mechanics of EO3:
https://forums.somethingawful.com/showthread.php?threadid=3720891