Thread:Deathstalker666/@comment-26005008-20160407215658/@comment-1496755-20160629121710

I think they are considered spin-offs. Quake Live is an online version of Quake 3 / TA, while Enemy Territory is often viewed as its own series (with ETQW being a Quake-flavored instalment).

So I suppose QC qualifies as the genuine "fifth Quake game". If they actually make a "Quake 5" some day, we could always reclaim the redirect and use it as a real page.