Can GE make a roster of full SEA players? Or do they need
at least 3 Indian players because of the import rule?
They can do it if they want, just like SEN can sign 5 Brazilians I'm pretty sure
No, the roster core has to be from the team's region, no more country limitations within said region.
So GE are free to sign 3 SEA players
Yes, they just need 4 players to be from their general region (Pacific), otherwise no restrictions that I could find.
there are only restrictions for rosters with players from other franchises (in this case, americas and emea)