Why can t gta online characters be used in story mode?
Quick Answer
The provided evidence only describes Grand Theft Auto V's single-player story mode with its three fixed protagonists and does not address GTA Online characters or their relationship to story mode.
Explanation
The verified evidence states that Grand Theft Auto V's single-player story follows three specific protagonists: Michael De Santa, Franklin Clinton, and Trevor Philips. The evidence does not mention GTA Online, its characters, or any technical or design limitations regarding character usage between modes. Without additional sources confirming GTA Online's character structure, compatibility constraints, or Rockstar's design decisions for cross-mode character usage, no verifiable explanation can be provided. The question appears to require information beyond the scope of the cited evidence.