Soleil: fodder or merge?

I have a +atk -res one already built and pulled one while going for leif. Is firesweep sword worth it to fodder off or should i merge soleil?

Units i would fodder Firesweep to:
NY!Camilla (+atk -spd)
B!Roy (neutral)
Ayra (+hp -res)
Mia (+res -atk)