Q1: What does this card's (Rule) mean, exactly? (*This card's "This card/Digimon is also treated as having {{EffectLinkArchetype|Greymon}}" has been changed to "(Rule) Name: Also treated as having Greymon.")
This is a special rule for this card that always treats it as if it also includes the Greymon name. This card can be chosen for text that specifies cards with {{EffectLinkArchetype|Greymon|text=in their names}}. This card can't be chosen for text that specifies cards with the name Greymon.
Lv.6 Gaiomon EX4-048 R Mega | Virus | Dragonkin/X Antibody This card/Digimon is also treated as having [Greymon] in its name. [When Digivolving] Delete 1 of your opponent's Digimon with a play cost of 13 or more. If no Digimon was deleted by this effect, trash the top card of your opponent's security stack. [End of Your Turn] If you have a Tamer in play, this Digimon may digivolve into 1 card with [Gaiomon] in its name and a play cost of 13 or more in your hand, ignoring its digivolution requirements and without paying the cost.
Lv.6 Gaiomon EX4-048 R Mega | Virus | Dragonkin/X Antibody This card/Digimon is also treated as having [Greymon] in its name. [When Digivolving] Delete 1 of your opponent's Digimon with a play cost of 13 or more. If no Digimon was deleted by this effect, trash the top card of your opponent's security stack. [End of Your Turn] If you have a Tamer in play, this Digimon may digivolve into 1 card with [Gaiomon] in its name and a play cost of 13 or more in your hand, ignoring its digivolution requirements and without paying the cost.
Lv.6 Gaiomon EX4-048 R Mega | Virus | Dragonkin/X Antibody [When Digivolving] Delete 1 of your opponent's Digimon with a play cost of 13 or more. If no Digimon was deleted by this effect, trash the top card of your opponent's security stack. [End of Your Turn] If you have a Tamer in play, this Digimon may digivolve into 1 card with [Gaiomon] in its name and a play cost of 13 or more in your hand, ignoring its digivolution requirements and without paying the cost.
Lv.6 ガイオウモン EX4-048 R 究極体 | ウィルス種 | 竜人型/X抗体 このカード/デジモンは名称に「グレイモン」を含むものとしても扱う。 【進化時】登場コスト13以上の相手のデジモン1体を消滅させる。この効果で消滅しなかったなら、相手のセキュリティを上から1枚破棄する。 【自分のターン終了時】自分のテイマーがいるなら、このデジモンを手札の名称に「ガイオウモン」を含む登場コスト13以上のカード1枚に進化条件を無視してコストを支払わずに進化できる。