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I think that some grouping is good. It's likely to make the Hummingbird happy, and it minimizes duplicate content issues. But the keywords in the group need to synonyms, or nearly so. I recently combined two separate pages that used to be focused on "clothes drying rack" and on "laundry drying rack". To the customer, these words were interchangeable.  Afterwards the new combined page read better to the visitor and it made the site navigation more logical. Still waiting to see what it does for the ranking... But I wouldn't combine "soccer ball" and "volley ball" - even though they look the same and kids may use them interchangeably. People interested in one are not interested in the other...