Ranked is the closest in terms of player behavior to Randoms, while Coop has much lower stakes and is played a bit differently.
This doesn't mean we'll go directly to Random Battles from here. We'll look at the data we got and see if it paints enough of a picture for us to be able to predict general trends for introduction into Randoms. It's not always just about checking whether current balance state is ok, but also about how behavior changes over time, with different balancing factors being applied in the timeframe. Eventually, if everything goes well, subs will see Random Battles, but we'll also be looking at what accompanying content should be in that patch, as well as the neighboring ones. It's all important.