Not all multipliers are equal. For example, Tamilin has better Dodge and Resistance but worse Toughness multipliers than Selen. Dexterity is the highest priority for these two, so Tam's higher Dex multiplier is used most and may give the biggest advantage. Selen's higher Toughness multiplier will get the second most use, and is very important for raw survivability and melee oriented builds. Tamilin's superior resistance is nice but doesn't seem very important in Episodes 1 & 2 where I rarely assign points to Willpower.