AsNoriuanswered grow question 4d ago I had few twins to grow, have tried 3-4 plants in one pot, eventually i never got desired result.
Some growers here had amazing results.
Yours is already behind, but with big root system, it would be stupid to leave it to rot, while other still grows.
Try to lst bigger one as much as you can , clear lower well after final stretch.
At least i would do that.