So, I've just finished chapter 20. I hit a snag on my first go around when all of my guys were too slow to get to Legault and the member's card thief in time (even if Oswin had 16 speed at level 20/1). I was also supporting Oswin with Dorcas (because Dorcas had 15 str, 12 skill, 12 speed, and 42 HP at level 13). But yeah, things weren't going my way. So I changed it up and decided if I was going to do this, I'd use all the mounted units (because Lowen and Marcus make Eliwood not suck).
Currently, I'm using my three lords and all my mounted units. Lowen is doing better than both Kent and Sain (he's level 14 with 14 str, 13 skill, 14 speed, 12 defence, and 8 resistance). Hector's got below average defence, skill, and speed, but Eliwood is making up for it with way above average stats across the board.
I could not get 19xx. Kishuna kept fleeing before I could line him up for the kill.