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Hero may be dealt a better hand for showdown value, but hero is more than likely not to be given a more +EV opportunity.

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Maybe, maybe not. For sure you'll be dealt a better hand than j8 offsuit.

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That's beside the point. In Hero's situation, the most number of potential callers is 2. If Hero folds and waits for better cards than J8o, there are now 5 possible opponents who may also pick up better cards themselves.

The chances of Hero getting better cards in the next three hands may be good (which I assume is your rationale for folding), but the chances of one of the other five players getting even better cards are higher.