The current GTAO writers seem to have a fucking hard-on for making all the possible choices a player could make have that canon one. Before GTAO none of the main story endings were canon, but they made it so that C is actually the canon choice. And now they are making this one choice of a single story mission canon, by making it so the annoying kike prick is actually alive.
I wouldn't be surprised if they went so far to make the Revenge ending of GTA IV canon in some very nauseatingly blunt way. Or even worse, making it so that Kate actually somehow survived and that Niko lived with her happily ever after. Just leave IV alone, it was a fantastically written game and the fact that both of it's endings are tragic in some way and it's up to the player to choose his tragedy is refreshing from all the super happy Hollywood endings like the C one in V.
Still, fuck Kate, Mallorie is a better woman and Roman is more important than some potato munching tramp. She would dump Niko after choosing Deal anyway.