The website BJJ Scout, which is focused on breaking down the games of elite BJJ competitors. BJJ Scout is in the midst of a three part takedown study, starting with BJJ star Rodolfo Vieira. Both videos are fantastic but the first one mentioned that the aspect of Rodolfo's game related directly to Ronda Rousey's takedowns.
This video goes more in-depth on Rousey, looking at her favorite takedown chains, the grips she likes, and how she has been adapting her Judo to MMA. While many paint Rousey as a one-trick pony, this video does a fantastic job showing that Rousey has a variety of takedowns and is an extremely skilled athlete. It also looks at how her opponents have tried to use straight punches and footwork to fend off the Judo attack, and how Rousey has adjusted to account for those tactics.