why the necessity of worshipping SriKrishna when Lord Gauranga is Krishna Himself?

There exists many a time, a fallacious reasoning that goes to justify that the worship of Lord Gauranga as all in all and does not entail the worship of Krishna since they are identical truths.It is a fact that those without the proper service attitude to the Supreme Lord will sometimes differentiate Sriman Mahaprabhu and the Supreme Lord SriKrishna. In his own composition, 'Manah Siksha' ,Srila Raghunath Das Goswami has written a verse beginning with - Sachisunumnandiswarapatisutve--which means, O mind !,Please remember always Lord Gauranga Mahaprabhu in the form of SriKrishna and the spiritual master as the dear most servant of Lord Mukunda .In this context, Srila Das Goswami has urged all to remember the son of Sachi as Lord SriKrishna,but at no point does he not minimize the importance of worshipping Lord Krishna. If he had that notion then there would be no possibility that he would have insisted further on viewing the spiritual master as the dear most servant of Lord Mukunda.The Spiritual master shows the way of performance of pure devotional service by his exemplary conduct and he is always entrenched in the devotional service of Lord Krishna.

The devotee who is conducting devotional service in practice(sadhana-bhakti) has to worship Gauranga initially leading to worship of Lord Krishna but the perfected soul simply worships Lord Gauranga which in that elevated state is equivalent to Krishna .However,the neophyte who has material contamination and impurities cannot expect to approach Krishna directly for such a foolish attempt will make him suffer the same dire fate as Agha,Baka,Putana and will surely meet his death prematurely.

The magnanimous incarnation ,Lord Gauranga gave the highest devotion in loving mellows to Ramananda Raya who was a Governor and a materialistic man in the eyes of the public,also to Sarvabhauma who was previously a hardcore impersonalist ,what to speak! he even removed all material contamination and awarded the highest devotion and divine service to the most hardened criminals like Jagai and Madhai.Srila Krishna das Kaviraj has elucidated the method of devotion to Krishna as firstly worshipping the spiritual master ,followed by Lord Gauranga and finally SriGandhirvakka Giridhari(Radha-Krishna).He never in the least tolerated those who try to worship the spiritual master as the form of Gauranga.