Generally on The Flash, wherever Captain Cold has been it's balanced out by the presence of Heat Wave, aka Mick Rory. The two work closely together on every crime they commit, and tend to come as a package deal. So it was strange that we didn't get to see him here. He was mentioned by Snart's sister, Lisa, who said that they're been committing some robbery or another, but that's all we hear of him. This despite the fact that Captain Cold and Golden Glider are both central figures in the episode, and they're his two closest friends. I get that it was much more of a family affair, but with Lewis Snart putting a team together, why didn't Rory get an invite? It's even stranger when you consider that he will be joining Captain Cold over on Legends of Tomorrow, so will have to be reintroduced at some point.