If I activate this card's [All Turns] effect when multiples of my other Digimon with [Knightmon] in their text would leave the battle area by my opponent's effects at the same time, and I place this Digimon as 1 of those Digimon's bottom digivolution card, are all of my other Digimon with [Knightmon] in their text prevented from leaving the battle area?
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Official Ruling
No, only the Digimon where this card was placed as the bottom digivolution card is prevented from leaving the battle area.
Source: P-154 Maildramon