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Gyo was introduced in the Heaven's Arena arc. Gon used it to see Hisoka's Bungee Gum in their fight while Machi and Wing did the same thing to see through Hisoka's In which was then taught to Gon, Killua and Zushi as they replayed the fight to learn to see through his In. So it was already a concept that existed before and during the Phantom Troupe arc and the Spidera are top tier Nen users, if Machi could use it. There is no reason to suspect the others couldn't do it either. Assuming they couldn't, Machi should've been enough. To see through his tricks at one point but at another time forgetting to use it is an amateur mistake. One that Bisky made sure to correct about Gon and Killua by making them use Gyo everytime she pointed her finger. The Phantom Troupe aren't amateurs, they're professionals.
Sometimes it's just for the convenience of the plot you know and you have to give a writer some rope. If no one made a mistake and did everything right all the time one may not have a story to tell. Just imagine - what would have happened if the King and his bodyguards would have fought a more coordinated fight with Gon and company? Chimeras lost because each of them was doing things on his own by the end and they didn't act as a unit. They thought they were doing their best in the kings interest but their decisions were individual decisions and not coordinated and in the end it didn't work out neither for them nor their king. But would you prefer it in any other way?
