Pretty sure
[Idol of Terror] has an ICD of 10 seconds.
There's too much variance in wws reports to be able to conclusively test minute differences such as DPS contribution of Idols. Your DPS is much likely to change based on what group you were in, what consumables you used, how tight your cycles were, how lucky (or unlucky) you got with crits/dodges/misses, whether you had to Innervate or Battle res someone, how aggressively you powershifted etc etc. All the modeling I've seen on Idols (including my own napkin math) points to
[Everbloom Idol] being the highest
personal DPS Idol in a fully raid buffed/debuffed situation.