Why do you recommend dash in SH Rising Fair back instead of dash in SH Nair in place versus Fox from TR? And why the reverse versus Falcon? SH Rising Fair back puts more distance between Marth and his opponent, is somewhat faster on the swing, but doesn't last as long as Nair (which might be a good thing versus Fox?). From this information I'd guess that it's because Fox is a faster character, who can threaten Marth's aerial lag more than Falcon can, so Marth wants to use faster swings at retreat more out of those swings so Fox can't patrol him as hard; and also that Falcon, because of his lunging style of approach, is better countered by a hitbox that stays out a long time, even if it's a little slower to come out because you can see him coming easier. How do you feel about my reasoning? What would you add/correct?
If I'm correct about these general ideas, then where does Nair fit in at TR versus Fox, and Fair versus Falcon? I don't quite understand when Nair would do a better job than Fair unless I was standing in place (rather than dashing) and not sure about Fox's approach timing? For SH Rising Fair back versus Falcon at TR, I'm not sure if there's a situation it's better than Nair, either in place or out of dash in? And for other variations of Fair I don't have a clue - it's great when Falcon is cornered/offstage but I'm not sure how to use it in more "true neutral" positions.