Conversation so far:
How was Timbiriche founded in 1982?
Timbiriche made its official debut on 30 April 1982 on the Mexican television show Siempre en Domingo.
Who were the original members of Timbiriche in 1982?
What else is known about Timbiriche as a children's band besides making its official debut on Mexican television show Siempre en Domingo?
The producers considered the idea of integrating a third male member into Timbiriche. The chosen one was Erik Rubín, who joined the band in December 1983.

Question: How was it of advantage to the band?
Self-contained rewrite: How was adding a third male member of advantage to Timbiriche?