It seems obvious to me that VC will eventually outgrow the output of the optimized plant and ultimately still invade Gecko. IMO, option #2 above is unrealistic and inconsistent with VC's policies as portrayed in the game.
This is one of the bits fixed in the restoration project as 'The best ending for Gecko, which would require you to optimize the plant and get the Gecko Holodisk from Gordon after talking to the Brain, is impossible to get due to a silly bug in the endings script', according to v1.2 of Per's definitive guide. Click to expand.The Gecko reasoning is simple:Ġ- Unfixed power plant => Dangerous radiation => VC invades to neutralize the threat.ġ- Fixed but unoptimized plant => Not enough power for both VC and Gecko => VC invades to secure the extra power they need.Ģ- Optimized power plant => Enough power for both VC and Gecko => Everyone lives happily ever after!