The seats are apportioned based on GDP, not population. Meanwhile, the alliances are loose idealogical caucuses that candidates group with. For instance, the liberal in Arizona-Los Angeles is a member of the Progressive Party, while the liberal in Taiwan-Fuijan is a member of the Chinese Communist Party. There are a number of smaller parties and groupings, but all of the delegates in this session associate either with Sadikin's majority government or the opposition.
That caucus wouldn't get called Liberal - the FDP in Germany and Liberal Party in Australia come to mind as parties who are liberal (or even conservative-leaning) but wouldn't want to caucus with communists.