There’s a difference between PI and prestige. High prestige does not directly correlate to a high PI. Masteries also have a significant impact on PI (but not prestige) and champions benefit differently from your mastery setup. Your best option here is to not worry about it. At the end of the day PI really doesn’t mean much, it’s just cool to see big numbers sometimes.
Something else to keep in mind is just because a champion has great prestige at sig 200 doesn't mean they have good prestige unawakened. For example, Spot has almost 1000 less prestige than herc at sig 0.
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Your best option here is to not worry about it. At the end of the day PI really doesn’t mean much, it’s just cool to see big numbers sometimes.