From this it would seem 10 to 20 person teams are the sweet spot for mobile game development.
Now I just need to find 9 to 19 more developers for my project :)
So if you look at figure 7b, the sweet spot seems to be a team size of 6 to 9 people (where the median revenue per developer per month is $550 to $820. In contrast, the median revenue per developer per month for 10 to 19 person teams is $320 - $620).
If you can hire 19 people, you should probably split them to run two projects of 6-9 people each. :-]
Luckily, we've found that if you start, Fate will lend you a hand and deliver some needed help.
That said, keeping momentum, coding away, and most of all greatly enjoying the process of creating something will really help you.