Help with Armor Emblem!

First of all, I want a red unit for my Armor Emblem but there are like 5 of them?? So I chose Zelgius. But I also want a fast unit since my other units' speed can only prevent doubles, and I gave him speed and a Firesweep Sword. Would something like that even work? I'm waiting for Zelgius to be a Focus unit first, so it can wait for the time being.

Second of all, do I need more than one Armor March on my team? My armor team is going to be B!Ephraim, LA!Eliwood, Zelgius and probably a ranged armor (haven't decided on one yet), and B!Ephraim is the only one with Armor March. Zelgius wouldn't need it because of Warp Powder and Firesweep Sword negating counters, Eliwood would walk alongside Ephraim, and the fourth unit would use Armored Boots? Or should it run Armor March? I kind of want to have Hone Armor as well... what do y'all think?