What characters in the series have ever LOST screentime thanks to an MU? FE12 gave supports for everyone through MU when none of them had ANY screentime. Plus, in most games, only the Jeigan/Oifayes, advisors, and the lords get any real screentime consistently. FE8 had Seth as the only recurring character in cutscenes, and FE13 had only Frederick, Lissa and the khans.
Besides, I really want to read a good FE fanfic one of these days.