It's not about having a scale! Grealish partied and crash a car and left the scene during lockdown, Walker broke lockdown rules and entertained sex workers (allegedly) and of course Maguire.
I suspect, although I don't obviously know for certain, that if Southgate wanted to keep him he would...
https://theathletic.com/2700099/2021/07/13/allan-russell-the-striker-coach-who-left-his-job-with-england-just-before-euro-2020/
Interesting article about someone I wasn't aware of.
Seems odd that the the England set up ditched Russell yet stand by players who possibly have done worse.