Here, as everywhere, we must assume gradual development of the new rather than sudden emergence. (religion-online.org)
It was a very long gradual development but that was where the seed was planted. (creativeboom.com)
First announced back in November 2012 as a feature article for Nintendo Power's final issue, it spent two more years in gradual development before finally hitting the US last October and February 2015 in Europe. (nintendocastle.com)