Ponniyin Selvan Varalaatru Peravai

Somehow I could get the book Nandhipurathu Naayagi. After much
struggle, I could get the address of the author and asked my cousin to
go and buy that book.
Now I have read half of the firrst volume.

But I have a few doubts.

1. Why Kalki never mentioned in PS, that the other name of Pazhaiyaarai
was Nandhipuram?
2. Vikraman has never mentioned anything about Poonkuzhali? Was she an
imagination of Kalki??
3. He mentions a person by name Veera Narayanan. Is this
"Aazhvarkaadiyaan"?
4. In a chapter he mentions Mathuraanthaka Thevar as "Sembiyan
Maadeviyin ThiruvayiRu uditha Thevar". But never mentions about the
"aaLmaaRaattam". Which is true?
5. Amarabhujangan is depicted as a 16 year old boy (the Pandiyan boy to
whom, Pattabhishekam is done in Thiruppurambiyam PaLLippadai), the son
of the slain Veera Pandiyan. But Kalki depicts Amarabhujangan as the
changed name of Madhuranthakan after he joins with Ravidaasan & Co.
Which is true??

I believe atleast a few of you would have read NPN as well. Could you
please throw more light on the the above??

I remember there were some messages / queries exchanged on
Panchavanmaadevi, one of the queens of Arulmozhi. I believe she was the
daughter of Periya PazhuvEttaraiyar. This character comes through in
NPN. Couldn't understand, why Kalki never made mention of her.

Once I finished reading PS, the first time, I couldn't digest the
ending. Actually there was no ending as it marked the beginning of a
great era of RR. So to find out whether Kalki had put any pointers to
what happened after that, I read the novel thrice. But still, a kind of
void space was in my mind, as I couldn't picturize the saga of RR.
Especially the fate of Kundhavai and Vandiyathevan was dangling.
NPN is really quenching my thirst, even though there are quite a few
contradictions between PS & NPN and story doesn't move as quickly as in
PS.