Lord Krsna is the Supreme Personality of Godhead and cause of all causes, His expansions, sakti potencies and attributes are fully explained in Srimad Bhagavatam and Caitanya Caritāmṛta.

There is no difference between Lord Kṛṣṇa and Lord Caitanya Mahāprabhu.  

When Lord Caitanya Mahaprabhu came to this world in 1486 AD, a great number of His associates came with Him who were His Visnu-tattva expansions. 

This means they were different expansions of Krsna (God) Himself.

Even in the Pancha-tattva of 5 great devotees, only one is jiva-tattva (jiva-soul), all the others are Visnu-tattva (different aspects of God).

And Visnu-"sakti"-tattva is Krsna's (God's) internal energy where direct expansions of Himself are playing different roles in His own pastimes.

"Sakti" also means the energy of Krsna.

The term Visnu-"sakti"-tattva includes Srimati Radharani who Krsna created by dividing Himself into two separate spiritual bodies so Krsna could experience loving exchanges in a "two-way" reciprocal relationship.

When Radha and Krsna unite as one, that is Lord Caitanya Mahāprabhu as explained in Caitanya Caritāmṛta.

The jiva-tattvas (the marginal living entities or jiva-souls) are not Krsna, even though they are His energy, they are His independent "separate energies" with their own free-will.

The jiva-souls can never be equal to Krsna, His Visnu-tattva expansion or Lord Siva who is in a league of his own between the jiva-souls and Visnu-tattva.  

1 - Krsna has 100% of His own qualities and is the Supreme Personality of Godhead and cause of all causes.

2 - Visnu/Narayana has 93.75 % of Krsna's qualities which the unlimited expansions of Visnu has 60 of Krsna's 64 attributes.  

3 - Lord Siva has 84.375 % of Krsna's qualities which means he has 55 of Krsna's 64 attributes.

4 - Lord Brahma (jiva-soul) has 78.125% of Krsna's qualities which means he has 50 of Krsna's 64 attributes.

5 - Lord Brahma is jiva-tattva (jiva-soul). 

Like all jiva-souls or marginal living entities, who also have 78.125% of Krsna's qualities, which is 50 of Krsna's 64 attributes

Krsna as His original form never leaves Vṛndāvana.  

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)

Srila Prabhupada - "Kṛṣṇa is the original Supreme Personality of Godhead, and Baladeva (Balarama) is Kṛṣṇa's immediate expansion. Because Kṛṣṇa NEVER leaves Vṛndāvana, all the forms of Kṛṣṇa that appear elsewhere are His expansions." (BG, As It Is Ch 10 Text 37).

Bhagavad Purana (Srimad Bhagavatam) Canto I Ch 3 text 28

TEXT 28

ete cāṁśa-kalāḥ puṁsaḥ

kṛṣṇas tu bhagavān svayam

indrāri-vyākulaṁ lokaṁ

mṛḍayanti yuge yuge

Translation

All of the incarnations are either plenary portions or portions of the plenary portions of the Lord, but Lord Śrī Kṛṣṇa is the original Personality of Godhead. All of them appear on planets whenever there is a disturbance created by the atheists. The Lord incarnates to protect the theists. 

Purport by Srila Prabhupada 

Learned scholars in transcendental subjects have carefully analyzed the summum bonum Kṛṣṇa to have sixty-four principal attributes. 

All the expansions or categories of the Lord possess only some percentages of these attributes. But Śrī Kṛṣṇa is the possessor of the attributes cent percent. 

And His personal expansions such as svayam-prakāśa, tad-ekātmā up to the categories of the avatāras who are all viṣṇu-tattva, possess up to ninety-three percent of these transcendental attributes. 

Lord Śiva, who is neither avatāra nor āveśa nor in between them, possesses almost eighty-four percent of the attributes.

But the jīvas, or the individual living beings in different statuses of life, possess up to the limit of seventy-eight percent of the attributes. In the conditioned state of material existence, the living being possesses these attributes in very minute quantity, varying in terms of the pious life of the living being. 

The most perfect of living beings is Brahmā, the supreme administrator of one universe. He possesses seventy-eight percent of the attributes in full. 

All other demigods have the same attributes in less quantity, whereas human beings possess the attributes in very minute quantity. The standard of perfection for a human being is to develop the attributes up to seventy-eight percent in full.

The living being can never possess attributes like Śiva, Viṣṇu or Lord Kṛṣṇa. A living being can become godly by developing the seventy-eight-percent transcendental attributes in fullness, but he can never become a God like Śiva, Viṣṇu or Kṛṣṇa. He can become a Brahmā in due course.

The godly living beings who are all residents of the planets in the spiritual sky are eternal associates of God in different spiritual planets called Hari-dhāma and Maheśa-dhāma. 

The abode of Lord Kṛṣṇa above all spiritual planets is called Kṛṣṇaloka or Goloka Vṛndāvana, and the perfected living being, by developing seventy-eight percent of the above attributes in fullness, can enter the planet of Kṛṣṇaloka after leaving the present material body."