I can understand your thoughts about Mason Greenwood but selling him might not be the best idea. He is talented player who could help team especially as backup for Rasmus Hojlund. He is a good goal scorer and has a strong left leg. On the other hand Jadon Sancho is not working hard and is causing problems. If he won't apologize and try harder it is better for team to let him go. He's lazy and focuses too much on partying, which isn't what Manchester United needs. Team should choose players who care and work hard like Greenwood over ones who don't try their best like Sancho.
Even a player of Sancho's caliber was just let go so I wouldn't be too surprised if Greenwood also left because with Manchester United's current condition where the coach is very confused about taking action and with Greenwood's situation there will definitely be some rejections that occur, just like in several seasons. then when the case came up it was very difficult to defend Greenwood now.
Unless Manchester United close their eyes and ears to Greenwood's problems and make some waves with the coach because as long as Ten Hag is there then the decisions taken will obviously be funny in the end.
Sancho, who he ignored, is now very valuable back at Dortmund and it is likely that Sancho will be retained. Apart from that, Greenwood's widespread problems also caused him to be released, although this is not United's fault, but it cannot be denied that at this time letting him go is a decision that can be made because he is being retained. will create controversy among supporters.