Depends on where the bottleneck is. Some problems don't speed up when more resources are thrown at them, and communication among greater numbers of people is more difficult, requires more coordination, etc. Something like asset generation could benefit from having more bodies thrown at it, which is exactly why FFXV is outsourcing some of it to that Taipei studio, forget their name. Anything that requires lots of planning and conversation, however (story elements, overall feel, presentation, design decisions, writing, etc.), is going to take however long it takes.
I see. At least they know the general outline of the plot right from the start.
Thanks for the reply!