Sorry, I made a typo. I mean Rarga cannot speak Chinese now. He can speak English.

He doesn't speak English. But from the experience of VCT cn, the language barrier of duelists or sentinels may not affect the strength of the team, e.g.Nova and DRG.
The best way is to follow the way of JDG and FPX, whose IGL can speak both Chinese and English. For example, if XLG can get Midnight (RA is ready to sell him), a bilingual IGL in Chinese and English, XLG may not become too weak.

Language is the main problem. Kr1stal only speak Russian and English. In ascension, they had two Russian players, so they can speak English. Kr1stal can speak Russian with Rarga too. But in Vct cn, only one russian player can remain. Thinking about one Russian IGL use English to command four Chinese players. It's crazy.