In final fantasy 1, it's actually a bad idea to give the strongest weapon (Masamune) to your strongest unit (the knight). This is because any party member can equip Masamune, and while the knight will use its high attack value most efficiently, he can also equip several only slightly weaker weapons such as Xcaliber.

For a mage or ninja, however, Masamune represents a gigantic boost - turning even your black or white wizard into a relevant physical attacker. In a way, this too is yuri.