Simply Sarah
Member
Ellie's OHKO is the only reason she is above the 2 other powerhouses. Touma is so low because Tsubasa is too high; if I really needed an extra session, she could give it to me. He might get access to a better debuff, but it's hardly necessary. I've come around to the thought that Conqueror is the better class for Chrom so that translates to needing better magical power on the field. I haven't gotten access to the ultimate skills for everyone so, yeah, this is where I am now.
Ah, that makes sense. Yes, Tsubasa is, when you factor in how sessions work, pretty much just a better Touma as a main cast character whereas Touma is much better than she is as a sub character. He's really the closest to being a character completely outclassed by another. Gaia's Whisper can be great but you can always just swap him in to use it. And yes, Fog Breath does the most important parts of what Debilitate does.
I certainly agree with you on Chrom if you're without access to Elec Mastery+ and Thoron although I'm thinking once you have those Great Lord probably becomes the better choice based on the numbers (subject to actually testing it).
That said, I'm not convinced that physical Itsuki necessitates a higher magic focus of the other two active characters, at least not as a general rule. There are certainly cases where this is true, though.