Kṛṣṇa also happened to be grandfather of Mahārāja Parīkṣit. Because Kṛṣṇa's sister was married to Arjuna, and Mahārāja Parīkṣit is the grandson of Subhadrā, Arjuna's wife. Therefore Kṛṣṇa also happens to be grandfather of Mahārāja Parīkṣit, and Mahārāja Yudhiṣṭhira also happens to be grandfather, being the eldest brother of his grandfather.
So Kṛṣṇa is the authority. Therefore Śukadeva Gosvāmī is giving authoritative answer as it was spoken by Kṛṣṇa. This is the way of speaking. One should cite authority. Śukadeva Gosvāmī was not less authority. As I described the other day that there are twelve authorities.
Out of them, Śukadeva Gosvāmī himself is one of the authorities. But still, he is citing the authority of Kṛṣṇa. That is the way of presenting things. That is called Vedic knowledge, that you must giving . . . whatever you say, it must be supported by the authority. Just like a good lawyer, he gives good evidence from other courts' judgment, authority.
So Śukadeva Gosvāmī said that, "This very question was inquired by your grandfather, Mahārāja Yudhiṣṭhira, to Kṛṣṇa, because they were put into so many calamities, the Pāṇḍavas. Kṛṣṇa was their personal friend; still, they were put into so many calamities for which they had to fight forcibly."
So Kṛṣṇa answered. When Mahārāja Yudhiṣṭhira inquired, "Why this contradiction? The Vaiṣṇava, who is worshiper of the most opulent personality, Viṣṇu, they appear to be poorer, whereas the worshiper of Lord Śiva, who appears to be poorer than ordinary man, they become very richer. Why?"
Kṛṣṇa answered that, yasyāham anugṛhnāmi hariṣye tad-dhanam śanaiḥ (SB 10.88.8): "My dear brother, Yudhiṣṭhira, My first evidence of mercy to My devotee is to plunder all his wealth, whatever he has got." You see? "Whatever he has got, I take it away. Then he tries again to accumulate some money. Again I take it away. In this way, he tries; I take away. When he becomes confused and baffled, he fully surrenders unto Me."