"Riyad Mahrez thinks it was a good win. Sergio Aguero thinks the most important thing was to win the trophy. They really do."
(From The Guardian's sport report.)
Does the verb "do" in the passage above substitute for the verb "think"?
No, you can't just say They really think. But you can say They really do think that. Or shorten it to They really do.
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No, you can't just say They really think.
But you can say They really do think that.
Or shorten it to They really do.
However, note that the sentence implies that thy are both saying the same thing. I don't feel that they are., so the whole sentence sounds wrong to me.