Q1: Can I use the End of All Turns effect in this card's inherited effect to play this card itself when this card is in a Digimon's digivolution cards?
Yes, you can.
Code Cracker Fang BT17-091 U SoC [Security] Play this card without paying the cost. [Start of Your Turn] If you have 2 or less memory, set it to 3. [Main] <Mind Link> with 1 of your Digimon with the [Dark Animal] or [SoC] trait. (Place this Tamer as that Digimon's bottom digivolution card if there are no Tamer cards in its digivolution cards.) (Rule) Name: Also treated as [Eiji Nagasumi].
Code Cracker Fang BT17-091 U SoC [Security] Play this card without paying the cost. [Start of Your Turn] If you have 2 or less memory, set it to 3. [Main] <Mind Link> with 1 of your Digimon with the [Dark Animal] or [SoC] trait. (Place this Tamer as that Digimon's bottom digivolution card if there are no Tamer cards in its digivolution cards.) (Rule) Name: Also treated as [Eiji Nagasumi]. --- [All Turns] While this Digimon has the [Dark Animal] or [SoC] trait, it gains <Alliance> and <Blocker>. [End of All Turns] You may play 1 [Eiji Nagasumi] from this Digimon's digivolution cards without paying the cost.
Code Cracker Fang BT17-091 U SoC [Security] Play this card without paying the cost. [Start of Your Turn] If you have 2 or less memory, set it to 3. [Main] <Mind Link> 1 of your Digimon with the [Dark Animal] or [SoC] trait. (Rule) Name: Also treated as [Eiji Nagasumi]. --- [All Turns] While this Digimon has the [Dark Animal] or [SoC] trait, it gains <Alliance> and <Blocker>. [End of All Turns] You may play 1 [Eiji Nagasumi] from this Digimon's digivolution cards without paying the cost.
クラッカー• ファング BT17-091 U SoC 【セキュリティ】このカードをコストを支払わずに登場させる。 【自分のターン開始時】メモリーが2以下なら、3にする。 【メイン】特徴に「魔獣型」/「SoC」を持つ自分のデジモン1体に≪マインドリンク≫(このテイマーを、進化元にテイマーカードが無いそのデジモンの進化元の下に置く)。 〈ルール〉名称:「永住瑛士」としても扱う。 --- 【お互いのターン】このデジモンが特徴に「魔獣型」/「SoC」を持つ間、このデジモンは≪連携≫と≪ブロッカー≫を得る。 【お互いのターン終了時】このデジモンの進化元から、「永住瑛士」1枚をコストを支払わずに登場できる。