CJ and Franklin being related is one of those myths that won't ever die even though it's definitively not true. So, yeah, expect this topic to keep trucking along.
What evidence is there that Trevor killed Niko?
Where is it?
Screencap and point it out.
@JelzyFunk Clicking on his profile shows only one post, which makes me think he may be a troll trying to provoke a reaction.
CJ is not mentioned anywhere in GTA V.
Trying to talk logic in relation to GTA myths is madness at its most futile. Most so-called "myth hunters" just outright make sh*t up that isn't supported anywhere in the game.
Liberty City and Los Santos being completely redesigned from their 3D counterparts is one reason. Even Grove Street looks nothing like its 3D iteration. Besides, I'd rather have their stories left open-ended rather than end in a way that might be undesirable. The only thing that stopped players from complaining about John's death in RDR1 was their shifting to complaining about Arthur's death in RDR2.