Q1: When I use this card's Delay effect to digivolve into a Digimon card with Gallantmon in its name in the hand, can it digivolve regardless of its digivolution requirements?
No, this card's Delay effect does not allow ignoring digivolution requirements, so you can only digivolve into a card that meets the digivolution requirements.
Crimson Savior BT17-096 U [Main] You may play 1 [Guilmon] or [Takato Matsuki] from your hand or trash without paying the cost. Then, place this card in the battle area. [All Turns] When an opponent's level 5 or higher Digimon is played, <Delay> • 1 of your Digimon may digivolve into a Digimon card with [Gallantmon] in its name in the hand without paying the cost. --- Inherited: -
Crimson Savior BT17-096 U [Main] You may play 1 [Guilmon] or [Takato Matsuki] from your hand or trash without paying the cost. Then, place this card in the battle area. [All Turns] When an opponent's level 5 or higher Digimon is played, <Delay> • 1 of your Digimon may digivolve into a Digimon card with [Gallantmon] in its name in the hand without paying the cost. --- Inherited: [Security] Activate this card's [Main] effect.
Crimson Savior BT17-096 U [Main] You may play 1 [Guilmon] or [Takato Matsuki] from your hand or trash without paying the cost. Then, place this card in the battle area. [All Turns] When an opponent's level 5 or higher Digimon is played, <Delay> • 1 of your Digimon may digivolve into a Digimon card with [Gallantmon] in its name in the hand without paying the cost.
紅蓮の救世主 BT17-096 U 【メイン】自分の手札/トラッシュから、「ギルモン」/「松田啓人」1枚をコストを支払わずに登場できる。その後、このカードをバトルエリアに置く。 【お互いのターン】Lv.5以上の相手のデジモンが登場したとき、≪ディレイ≫。 • 自分のデジモン1体を手札の名称に「デュークモン」を含むデジモンカードにコストを支払わずに進化できる。 --- Inherited: 【セキュリティ】このカードの【メイン】効果を発揮する。