Rsabhadeva was the direct incarnation of the SPG, the cause of all causes. His son, Bharata Maharaja, who was now acting as the brahmana Jada Bharata, had received his body from the cause of all causes. Therefore he is addressed as karana-vigrahaya

Expressions researched:
"Ṛṣabhadeva was the direct incarnation of the Supreme Personality of Godhead, the cause of all causes. His son, Bharata Mahārāja, who was now acting as the brāhmaṇa Jaḍa Bharata, had received his body from the cause of all causes. Therefore he is addressed as kāraṇa-vigrahāya"

Srimad-Bhagavatam

SB Canto 5

From the Brahma-saṁhitā we understand the Supreme Personality of Godhead is the cause of all causes (sarva-kāraṇa-kāraṇam (BS 5.1)). Ṛṣabhadeva was the direct incarnation of the Supreme Personality of Godhead, the cause of all causes. His son, Bharata Mahārāja, who was now acting as the brāhmaṇa Jaḍa Bharata, had received his body from the cause of all causes. Therefore he is addressed as kāraṇa-vigrahāya.

SB 5.12.1, Translation and Purport

King Rahūgaṇa said: O most exalted personality, you are not different from the Supreme Personality of Godhead. By the influence of your true self, all kinds of contradiction in the śāstras have been removed. In the dress of a friend of a brāhmaṇa, you are hiding your transcendental blissful position. I offer my respectful obeisances unto you.

From the Brahma-saṁhitā we understand the Supreme Personality of Godhead is the cause of all causes (sarva-kāraṇa-kāraṇam (BS 5.1)). Ṛṣabhadeva was the direct incarnation of the Supreme Personality of Godhead, the cause of all causes. His son, Bharata Mahārāja, who was now acting as the brāhmaṇa Jaḍa Bharata, had received his body from the cause of all causes. Therefore he is addressed as kāraṇa-vigrahāya.