Yes it's irrelevant. Read the link I provides, it's from gsma.comIf google is first to market with all the infrastructure, installed-base of users, and add-on features to RCS that people actually want, the actual standard is irrelevant.
Because of the way RCS Universal Profile is structured and supported by different companies, both phone manufactures and Carriers from different countries you can't say Google has control over RCS or will ever have control over RCS, they can only influence it by bringing improvements to it, like any of the involved companies can.
If Google right now does anything to jeopardize RCS's status in the GSM industry, RCS is gone, so they aren't really in control of it.