Scenario 1 : Speed Equal.
Scenario 2: Seed unequal.No Kido
-Naraku- He could cream the opposition rather easily in both scenarios due to his ridiculous defenses and high destructive potential.
-Sesshomaru- With speed equalized, Sesshomaru's Bakusaiga would make him quite a threat against Bleach high tiers. Without the equalization, mid-tiers could dispose of him thanks to their more superior speed.