As i understand it Battletech and Surviving Mars is developed by other companies. Paradox is just the publisher. How much they have been involved in development in those games who knows.
(More like City Skylines and Surviving Mars.)
It's true that games developed by others give in less direct money, but they also cause less direct costs for PDX.
My point is that there is no need for Megacorp sales to save Q4. Has there even been a quarter with six releases before?