Krsna, as His original Form, NEVER leaves Vrindavana in the spiritual world.

Krsna is the Supreme Personality of Godhead and cause of ALL causes, and the original source of all Visnu and Narayana forms of God (Visnu-tattva).

Krsna, as His original Form, NEVER leaves Vrindavana in the spiritual world. 

Therefore, when Krsna comes to the material creation, He comes via His Visnu-tattva expansion, who plays the role of Krsna as His original Vrindavana form in the spiritual world. 

In other words, the Krsna who comes to the material world, is really a "four armed Visnu-tattva expansion" of the original two armed Krsna who plays the role of Krsna. 

So, when it is said only Kṛṣṇa has 64 qualities in full, it means He is the only one who has them ALL the time in full and not even His Visnu/Narayana forms can manifest all 64 qualities all the time. 

Even though it is also said that His Visnu-tattva expansions have only 60 of those 64 qualities, a Visnu-tattva expansion CAN occasionally manifest those 64 qualities temporarily, like when a four armed Visnu Form plays the role Krsna in the material world.

Remember, the original Krsna never leaves Vṛndāvana in the spiritual world but spiritually there absolutely is no difference between Krsna and Viṣṇu, only that Kṛṣṇa was first.

Srila Prabhupada explains-

Srila Prabhupada - "Although there are many expansions, Lord Śrī Kṛṣṇa is the origin, as confirmed in the Brahma-saṁhitā. He is like the original candle, from which many thousands and millions of candles are lit. Although any number of candles can be lit, the original candle still retains its identity as the origin. In this way Kṛṣṇa expands Himself into so many forms, and all these expansions are called viṣṇu-tattva. Viṣṇu is a large light, and we are small lights, but all are expansions of Kṛṣṇa." (CC Introduction)

Srila Prabhupada - "The original Lord Kṛṣṇa never leaves Goloka Vṛndāvana. All the plenary expansions are one and the same Viṣṇu-tattva, and there is no difference in Their potency. (SB, Canto 3 Ch 1 Text 34 Purport)

As said above, when Krsna comes to this material world for His childhood pastimes, it is His 4 armed Visnu-tattva expansion who play's the role of two armed Krsna as the paintings below reveals.

Srila Prabhupada - "Because Kṛṣṇa never leaves Vṛndāvana, all the Forms of Kṛṣṇa that appear elsewhere are His expansions. Vāsudeva is Kṛṣṇa's immediate expansion, so Vāsudeva is not different from Kṛṣṇa. It is to be understood that the Vāsudeva referred to in this verse of Bhagavad-gītā is Baladeva, or Balarāma, because He is the original source of all incarnations and thus He is the sole source of Vāsudeva. The immediate expansions of the Lord are called svāṁśa (personal Visnu/Narayana expansions), and there are also expansions called vibhinnāṁśa - separated jiva-tattva (jiva-soul) expansions." (BG, Ch 7 Text 2 Purport)

Srila Prabhupada - "Because Mathurā and Vṛndāvana are intimately connected with Kṛṣṇa eternally, it is said that Lord Kṛṣṇa NEVER leaves Vṛndāvana (vṛndāvanaṁ parityajya padam ekaṁ na gacchati)." (SB, Canto 3 Ch 1 Text 34 Purport)

Srimad Bhagavatam - "Since that time, the city of Mathurā had been the capital of all the kings of the Yadu dynasty. The city and district of Mathurā are very intimately connected with Kṛṣṇa, for Lord Kṛṣṇa lives there eternally." (SB, Canto 10 Ch 1 Text 28)

Srila Prabhupada - "It is understood that Mathurā City is the transcendental abode of Lord Kṛṣṇa; it is not an ordinary material city, for it is eternally connected with the Supreme Personality of Godhead. Vṛndāvana is within the jurisdiction of Mathurā, and it still continues to exist. At present, the place known as Vṛndāvana, in the district of Mathurā, continues its position as a transcendental place, and certainly anyone who goes there becomes transcendentally purified. Navadvīpa-dhāma is also intimately connected with Vrajabhūmi." (SB, Canto 10 Ch 1 Text 28 Purport)

Srila Prabhupada - "The great authority Śukadeva Gosvāmī remarks that Kṛṣṇa almost always passed His time with Rukmiṇī, and Rukmiṇī was a bit proud to be so fortunate that Kṛṣṇa NEVER left her even for a moment." (Krsna Book 60)

When Krsna enters the material creation for His Vrindavana pastimes, He does so as His Visnu expansion who plays the role of Krsna by acting the part of Krsna appearing like His original Form.

As said above, Krsna, as His original bodily Form NEVER leaves Goloka-Vrindavana in the spiritual world, this means He NEVER enters the decaying temporary material creation or even the perpetual Vaikuntha planets either as His original two-armed Form because child Krsna NEVER leaves Goloka-Vrindavana in the spiritual world as explained above.

The amazing twist here is because Balarama is Kṛṣṇa's first expansion, all other Visnu-tattva expansions come from Balarama as Prabhupada explains above." *<

Compiled by Gauragopala Dasa Acbsp (initiated by Srila Prabhupada on July 10th 1972).