There's 4 basic strategies to rerolling. One can reroll for:
1 core SSR kamihime
2 or more same-element SSR kamihime
As many SSR kamihime as possible
1 +100% eidolon
Notice that I don't include any mention of ordinary SSR eidolons in that list, as they're not even a consideration. When people give me accounts, I ask them to fill in the SSR kamihime and +100% eidolons, because that's all I need to judge the account's long-term potential from a pile of accounts. The +35% elemental eidolons in the shop are just fine as starter primary eidolons, even for accounts that start in an event deadzone... which aren't even in your list, including Vine, possibly the most significant SR eidolon in the entire game right now.
This gets at my major issue with the guide right now. A good overview needs to start with a top-down understanding of what's important. Without that all you have is a grocery list, even if all your facts are correct, and we already have perfectly good wikis for that.