(Yes, therefore guru is called the Kṛṣṇa's mercy-incarnation. Kṛṣṇa's mercy-incarnation is guru) 



Svarūpa Dāmodara: "Is it, is it also not the mercy of Kṛṣṇa that He has descended"
Prabhupāda: "Yes, therefore guru is called the Kṛṣṇa's mercy-incarnation. Kṛṣṇa's mercy-incarnation is guru. Guru-kṛṣṇa-prasāde pāya bhakti-latā-bīja (CC Madhya 19.151). Kṛṣṇa is so merciful, He's trying to educate from within, and outside He sends His representative to teach. So He's trying to bring all these living entities back to home, back to Godhead. Two ways: from inside and outside."
Comments
All Glories to His Divine Grace Srila Prabhupada