Once a mentor, always a mentor I'd say, but as official titles go yes. Sakura will be his equal eventually, it's something he'll cope with as all masters should. Naruto should come back with actual new techniques rather than nothing in canon >.>'' they'll impress each other I'm sure. 

Meanwhile in canon she got it in one chapter because the author didn't do shit with her but still needed her to have 'some' form of powerup to keep up with the boys, and it still meant almost nothing.

CANON SUCKS MAN. I hope Orphan Black never gets as bad as that manga did X.X