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You can answer this question, like most deckbuilding related questions, by using statistics

Once Chaos Angel is no longer face-up, like with the effects of Phalanx, S:P or Daruma, then is flipped face-up or returns to the field, it forgets the properties of the monsters used for its Synchro Summon, such as their attribute, therefore it loses the effects that it gains from being summoned by LIGHT/DARK monsters

While Yuma was happy to see him, Alito wanted to Duel Yuma and decided to give Nistro the "Number" card, then brainwashed him using "Rank-Up-Magic Barian's Force"

If you happen to be outside the US, Canada or the UK, theres still other ways that Pokemon Day is being celebrated

Altogether, they bring about $103 to the table

Getting that clean two-for-one, and dramatically altering the battlefield, is huge for helping turn the tide in your favour