It's a fact. Kurama using a more powerful Bijuu Dama than KN4 literally has nothing to do with the point. Kurama charged a small Bijuu Dama slower than he'd charge a standard while he was fighting Naruto. The comparison was between Kurama in two different occasions, not Kurama and KN4.
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-Took Gyuki that long to charge a BD, yet we've seen what he does in the future.
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-Look at Kurama's charge there. Lol. Then look at what he does later on, and in the future.
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Dramatic effect isn't a "petty excuse". It's used in almost all types of media. Do you think that Naruto really takes this long to enter Bijuu Mode?
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Lol of course not.