Part of answering the question here, is to first ask why, why is it, over 500 years after Lord Caitanya left the world, do people ask this question at all?
The answer to why, is because of the devotees of Caitanya. They have carried Lord Caitanya in their hearts generation to generation, decade to decade, from Bengal to the Land of the Oriya to now the entire world.
When I am dead, ShivaFan will quickly be forgotten. I have little doubt when you, or practically anyone on the Hinduism DIR is dead even if you think you are the greatest philosopher, you will be forgotten and your name and all of your debates and good doings and you will mean not much unless you give something good to your children than perhaps that goodness will live on with a piece of your heart.
You will likely be forgotten, yet you may ask for some reason, you may ask "Who is Caitanya?".
The Hindus may give you all kinds of answers. But if Caitanya matters, then you will only know if you ask Lord Caitanya yourself and see if Caitanya answers your question.
Now as for the opinions, really all that matters is not an opinion, or one sect giving you one scripture or another a different, those who tell you what they think Lord Caitanya's devotees say is Lord Caitanya then that is very helpful, even those Hindus who are not a devotee of Lord Caitanya but matter of factly tell you the truth of what the devotees say of Caitanya because of association, that is helpful. And better yet, the devotees themselves tell you.
What you do with it is just that, what you do with it and then go to Caitanya if you feel the need and ask. If there is no answer, than why should you care? If there is an answer, then that is nice for you.
I am not a member of the sect of devotees of Lord Caitanya. But because I know of the fame of Caitanya in Bengal and Orissa, and today in many parts of the world, I have no reason to lie about what the devotees of Lord Caitanya say regarding him. I may have misunderstood, but I will not lie.
In a few words, some of Lord Caitanya's devotees told me Caitanya is the manifestation of the mode of both separation and ecstasy between a devotee of Krishna and Krishna, much like the mode of separation and ecstasy between Radha and Krishna. Now different devotees will go into refined genres and rasas regarding these modes, that you can find out from them. But many if not most say that this bhaki of modes is in fact Krishna and so Caitanya can be said to be Krishna.
Now let me show you something interesting.
Shada bhuja or six armed form of Caitanya.
This lithograph is from the 1800s based on a long Bengali tradition of such depictions for hundreds of years.
It is a picture of Lord Caitanya.
You see Caitanya's goldren face, two arms of Rama, two arms of Krishna, two arms of Caitanya. When Caitanya went to see Lord Jagannath in Puri, Orissa, India, the Saint fell down unconscious before the Jagannath deities.
Sarvabhauma Bhattacharya, who would become a devotee, was there with another Hindu. He took Caitanya to his home not very far away from the Temple as if to help him. When Caitanya was fully awaken, Bhattacharya started to teach Caitanya the impersonalist doctrine. This went on for hours, then days, and then all of a sudden Caitanya turned into this six armed form - sadbhuja - right in front of Bhattacharya. Now Bhattacharya was not a sanyasi, but he thought he was a great erudite of Hinduism.
He then became a devotee of Caitanya. Make of it what you will.