No. Please, not this . No. Nooooooooooooooooooooooo.
BG 4.9 janma karma cha me divyamevam yo vetti tattvatah: |
tyaktvā deham punarjanma naiti māmeti so 'rjuna ||
O Arjun, My appearance (birth) and activities are divine, transcendental, [ pure, untouched by modes of material nature - sattva, raja tama]. One who knows this in Truth [has really really understood this principle of My Divinity and appearances], is not born in this world again, and comes to Me, becomes one with Me.
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Nārāyaṇ is, was and will always be pūrṇa nārāyaṇ, pūrṇa bramhan', untouched, untainted, unmoving, irrespective of peope' s fancies of dragging Him down to bondage just for their own spiritual convenience.
As for a Guru saying such, perhaps they looked at it as a means to make the disciples eat their spinach - sām dām danḍa bheda. Do what it takes .
Even your point 2 -- assumes there is a tokenID that Kṛshṇa had as a samsārī ordinary soul, which evolved over lifetimes . No. Nārāyaṇ was never in bondage. Ever . Nārāraṇ -- that directly descends, and we are talking about pūrṇa-purushottam bhagvān here, not even some other avatār .
Sometimes, empowered jivas -- empowered by Nārāyaṇ are also called āvesh avatār, shaktyāvesh . Kṛshṇa was not such .
Which were the previous births of Kṛshṇa? Nar-Nārāyaṇ Ṛshī, Shri Rām, Dattātreya, Hayagrīva, Yajña-Varāha, Matsya, Kūrma, Devaṛshi Nārad, 4 kumārs, ṚshabhDev, KapilDev, ...
None of them were born in kārmic bondage. They were forms Nārāyaṇ took directly as per the need of the times - the purpose, mission .
Descent of Nārāyaṇ is not well-understood easily by beginners, reading bhāgvat canto 1 chapter 3 or canto 2 chapter 7 may help.