Nope, only 50 devs at EM assisted CD with Avengers
The other 480+ were working on Tomb Raider and GOTG
June 2018
How Avengers and Tomb Raider maintain Eidos Montreal's status as the shining jewel of the region - MCV/DEVELOP
Eidos Montreal has crafted a fantastic legacy for itself during its 11 year history. We speak to studio head David Anfossi about the company’s future roadmap, development process and how its partnership with Marvel on the Avengers project fits into all that.www.mcvuk.com
That leaves a good bit for GotG, but I was talking about the last two years when Tomb Raider was released and it became clear that Avengers was a disaster in need of saving (though obviously the saving didn't go great if Avengers looks like it will get a 62 on Metacritic)