RangaRaja Nambi - does not have any reference or interaction with other Kamal’s.

Govind - Tells story abt Nambi
Sees George Bush in the Television and in the Sarithira Medai
Fletcher chase
Balram Naidu investigation
Krishnaveni patti’s parcel conversation
The only Kamal to see Poovaraghan when he was alive
meets Kalifullah Khan’s family in the accident
meets Avtaar Singh in the lift and after the concert(where Avtaar is actually shot)
Shringhen Narahasi in the climax

George Bush - Bush doesnt interact or refer any other Kamal. I think he sees photographs of Govind & Fletcher, but he doesnt utter their name

Fletcher - Govind in chase
about Avtaar - “Who is this guy?” in airport. and also he shoots Avtaar
No reference to Bush
Balram Naidu chases him in helicopter in climx
perhaps he might see Krishnaveni, but there is no clear indication n the film where he interacts or speaks abt patti
Nothing with Poovaraghan
gives a salaam ale khum to Kalifullah in hospital
climax fight with Shringhen

Balram Naidu
Meets Govind
Takes Patti to investigation
Meets Kalifullah
Meets Narahasi
Chases Fletcher

Krishnaveni Patti
Meets Govind
Then Balram Naidu
The only Kamal who see Poovaraghan as dead.

Poovaraghan - doesnt see or refer to any Kamal in the movie

Kalifullah
Meets Govind in the accident
Fletcher in home
Balram Naidu’s investigation

Avtaar Singh
Meets Govind
Fletcher shoots him
He sees Kalifulah.. tats evident cos, Avtaars son says”mujhe bhi itna lamba hona hai” enakkum avlo height aaganum..

Narahasi
Balram Naidu in commissioner office
climax fight with fletcher
he also talks to Govind

And also,

Govind is the only Kamal, having a link with all other Kamal’s. And thus he also becomes KATHAIYIN NAYAGAN(Kathai sollum naane Kathaiyin Nayagan aanen)

i think thalaivar has taken screenplay writing to new heights with dasa..