I've been a software developer team manager for about 5 years and a developer for the 8 before that, mostly in data drive web applications.
I can tell you they will gain very few, if any opportunities with the extra time.
the disruption to the organization of the team, and the departure of some key members, is going to for sure make it take longer to get what you would have previously got under the prior team, you have less people doing the same amount of work. Furthermore even if they hire new replacements immediately, it is going to take a lot of time for those new developers to get up to speed and become an effective part of the team. Its more than just knowing how to program. You have to understand the requirements, understand the architecture, understand the development processes of this specific team, get comfortable in a role and begin to be productive. Most new hires usually take 8-12 months on the job before they are truly productive in the middle of a large project.
That doesnt take into account any changes that are being made to the requirements or design of the game as part of this reorganization.
Even though we are talking about replacing lost people instead of adding additional people, most of the principals and corollaries of the "Mythical Man Month" still apply. Anyone interested in the topic should check out some brief youtube videos on the concept.
https://www.youtube.com/watch?v=Xsd7rJMmZHg
https://www.youtube.com/watch?v=Fp2GWaahvio