5 mods control 92 of the top 500 subreddits. Those bury brigades are real, but instead they just remove what they don't want seen or promote content they do want seen with huge influence in the most popular subreddits. The same issue with Digg power users having too much control (among other reasons it failed) is also apparent on Reddit.
https://i.redd.it/bfhl8s6o2fn41.png