He isn't wrong if you kill a mob 4+ levels higher than you, you tend to get a huge experience amount before bonuses applied. My FC already decided the best power level method would be to pull a group, lowbie aoe them, then aoe them dead with the highbie.

Likewise in 1.0 a good leveling method was exactly what the Doctor is posting about and I know it works in 2.0, it is just a matter of finding good spots and a good party. Even if you don't maintain chain fully it still stays better than fate grinding in most areas.