74 was actually the first year he established himself as a regular starter Flamengo. He actually won the Bola de Ouro in 74, which is the best player of the tournament. In 74 Brazil also had Rivelino as the 10. It would have been tough for a young Zico to take his spot from the Selecao. In 78 he started the first game or two. But then was pushed to the bench because of physical problems and/or CBD (predecessor to CBF) political interference. I can't really attest to the real reason, this is form Brazil Wikipedia.