The Sol Katti has less MT than a Silver Sword whilst being almost twice as heavy in exchange for...double damage against the Final Boss.
Lyn should have had the Mulagir instead.
Given that she has 4 Bow versions in Heroes to 1 Sword version, and she had Mulagir in Engage, it seems like the developers understand this too.
(Amusingly if you let Wallace die in Lyn Mode he returns promoted in E/H modes)
This is because if the character dies in Lyn Mode their stats are their E/H defaults in that mode.
20 HP Dorcas, 30 HP Robe'd Dorcas now the Robe actually prevented his death. It's an exaggeration and oversimplification but it's something to think about with defensive statboosters.
Robes give 7 HP in FE7 (and all games between FE3 and FE11 on that note.).
Typically giving statboosters to someone who already has enough of that stat for normal purposes is a bad idea, unless you're trying to juggernaut.
If Dorcas is somehow taking 20 damage from one attack, that means that you either fucked up on enemy phase and put him in the range of a mage, or you're DEF screwed. Or you're up against someone with a Silver Weapon earlier on.
If Florina is somehow taking 20 damage from one attack, it's because you massively fucked up on enemy phase and put her in range of an archer who wants to take the easy pickings.
Also Dorcas has 30 base HP and Florina has 17 (L)/18 (E/H) base HP you retard. If Dorcas is taking 30+ damage from something other than the Fire Dragon, you're FUBAR.
The question of whether you want to use statboosters is almost never about boss fights, unless you're already FUBAR. It's typically viability during the main part of the chapter, cleaning up the hordes of trash.