+1 merge brave Ike or give steady breath to +2 Linus

I don't think you should merge. It is only +1 to two stats, which may not end up as the one you want (in B!Ike's case you want Atk, or Def). Steady Breath is a valuable skill, so I think you should definitely inherit.

are u going to refine Basilikos to LnD3? If no then go ahead