Originally Posted by
Northern Goblin
Stat bonuses on level are the biggest reason I went back and did the most overly complex playthrough of minimising my early level gains just to obtain the right GF's to max out my squad stats.
Though you have the option to junction/GF+x%, being able to use your best spells on your caster, while using your other GF skillslots for abilities (Darkside+Leech Junction, Auto skills etc) means you can run two people (in my case Squall/Zell) as aura/haste boosted limitbreak spam machines while your caster (Quisitis/Selphie being the popular ones) as your support.