"Why did Arjuna ask Krishna to go to His four armed form rather than His two armed form after Krishna had showed Arjuna His Visvarupa?'' Because he understood that Krishna is the original Narayana. After seeing His Visvarupa, Arjuna was accustomed to see Krishna with two hands, but when he saw the Visvarupa, he understood Him the Supreme Personality of Godhead, and as such, he requested Him to revert to the original Form of Narayana. Then, Krishna after showing him the Narayana form, again to revert to His original Krishna form. Krishna explained that Narayana form is not original, but Krishna form in two hands is the original and even the demigods desire to see this form. (Srila Prabhupada Letter to Purusottama, Montreal 14 June, 1968)

Krishna Consciousness philosophy includes the whole Vaisnava philosophy. When we speak Krishna, the very Word means, Rama, Nrsimha, Varaha, and all other similar expansions and incarnations. So Krishna Consciousness includes Vaikuntha consciousness, but Vaikuntha consciousness does not include Krishna Consciousness. Those who are strictly following the rules and regulations of Vaisnava activities, they are promoted to Vaikuntha lokas. But those who have developed a spontaneous love for Krishna, they are promoted to the Krishna Loka. Therefore, although Krishna Consciousness includes Vaikuntha consciousness, pure Krishna Consciousness is spontaneous love for Krishna without any regulative principles. (Srila Prabhupada Letter to Rupanuga, Montreal 3 July, 1968)