Firesweep S L!Ryoma

Keep Bushido, i don't see why you would replace a skill that no other mounted unit can inherit for a skill that just moves you a space away from the foe. I would go with Heavy Blade as the SS as it will help you to charge the special trigger faster and Bushido dealing tons of damage to foes with high Def. Moonbow will do aswel

If you're going for an expensive build I would go with Chill Spd.

I wouldn't replace Bushido either. The plus is that you can give Ryoma hit and run for pretty cheap just to see how you like it. Not much harm there.

I would usually run Bushido since damage is fun. Hit and Run and Drag Back are common enough I'd probably inherit them for some maps or teams. Now with L!Hector you can run a QP+Luna setup too if you find him not killing enough.

I'm honestly not sure why you'd want to run Bushido and an offensive special with Firesweep, which lends itself absolutely perfectly to HB/Galeforce shenanigans. Why not run Slaying Edge or Wo Dao if you want to make use of pseudo-Wrath on a flier unit? They can at least be refined to greater effect than Firesweep.