If you don't need your Descendant on your side of the field for future use, you can tribute this card for "Caius the Shadow Monarch" to banish a card and have a monster with 900 more base attack than the "Gravekeeper's Descendant" you would have left in the first scenario.
You can tribute "Gravekeeper's Curse" after it inflicts 500 damage to your opponent since it wouldn't have other big uses.
You can use "Chain Whirlwind" when using his effect to destroy a card to destroy 2 of the opponents trap and/or spell cards for a +1 card advantage.
If your field has 4 Gravekeeper's monsters as well as this card, you can destroy up to 4 of your opponents cards. This can actually help set up an OTK situation if you are careful, if not you still have a potentially powerful monster when combined with "Gravekeeper's Priestess" and "Necrovalley's" ATK boosting effects.