Mint's original sin was joining NijisanjiEN after getting rejected by Hololive.
>Both Biboo and Ceci applied for early Hololive
>also failed because, just like Mint back then, they had little streaming experience.
>Went to work on their indie careers with some small success.
>Kept applying, and eventually got in.

Hiring Mint is just too much baggage for Cover now. She's too well-known and would debut with insane expectations
hell, it's still standard procedure at Hololive that you only get 3D after one year. Could Mint wait that long again? Could her fans?