Avatar or Expansion of Krishna: Maha-Vishnu

Q. I understand Lord Vishnu comes from Krishna who is the source of all sources, but in Hinduism this conception is not there. My question is why is that?

Q. (Based on the following references) How to reconcile the "gradual evolution" and the "simultaneous creation" explanations? I'm aware of the soul moving upwards through different species of life. It seems that Srila Prabhupada also says how there is a sequence and time factor of evolution from lower developed bodies into more complex forms. And then again he says that all forms come up simultaneously at once.

Some excerpts from Srila Prabhupada's writings:

Q. Krishna says in Bhagavad Gita that He is Kala (Kalosmi). So time is eternal. But when we practically speak ("In due course of time, time will answer" etc) it apparently looks as though time changes. Please clarify how to understand this?

I have gone through several websites for 'DASAVATAR' (ten incarnations), and there is a confusion whether Lord Krishna is an avatar or Sri Hari (the original Supreme Lord) Himself Who came down on earth. At a few sites Krishna is shown as an avatar and Balarama also as an avatar of Ananta Sheshanaag (also Lakshmana); while on some others Balarama is presented as avatar and they treat Krishna as Sri Hari Himself, the original Avtari, not an avatar.