Answer: Brooks overestimated his own contributions to the company.
Step-by-step explanation:
As it is stated that the articles always emphasize that Allegra's ideas are the driving force behind the company So, it is clear that Allegra's plays more important role in the start-up.
While Brooks overestimated his own contribution to the startup and this led to his outrage. Both work hard on their parts but people may like the idea behind start-up more lucrative.