Believe it or not, Indies do have managers regardless of how big they are. Both Bri's and Umi's manager were recent hires. Umi's manager is probably referring her work load and scheduling of her streams.
Edit: Hetaro, the co founder of Vrev is owning up to his mistakes. He claims there will be a shake up and "changes" after the girls' graduation. Fans calling him out on his corporate lip service. Lasakat, the other founder---get blasted with merch orders and lack of commuication.