3 official rulings from Bandai, last ruled Mar 28, 2024. Straight answers to how this card actually resolves.

If [Taiki Kudo] is among the cards revealed by this card's <Security> effect, can it be played?
Yes, that's correct.
Ruled Mar 28, 2024
If there is no Digimon card with the [Xros Heart] among the three revealed cards, can I still play [Taiki Kudo] from among the revealed cards?
Yes, you can play [Taiki Kudo] even if there isn't a Digimon card with the [Xros Heart].
Ruled Mar 28, 2024
This card's <Security> effect reveals 3 cards. If both a Digimon card with the [Xros Heart] and a [Taiki Kudo] are among the cards revealed, can I choose to only activate the effect that adds the Digimon to my hand and not play [Taiki Kudo], or the other way around?
No, if you perform any of this effect you must perform as much of it as possible, so if both a Digimon card with the [Xros Heart] and a [Taiki Kudo] are among the 3 cards revealed, you must perform both "add [...] to your hand" and "play 1 [Taiki Kudo]," or you must choose to perform neither.
Ruled Mar 28, 2024
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Questions and answers are Bandai's official rulings, collected and translated by the DigimonCardGame Wiki community and reused here under CC BY-SA. Card names and card text are © their respective publishers; Combalo is not affiliated with Bandai.