Reapiting Group Reordering and Minus Item

Hi guys, i need some help , im trying to remove a item from a list and reorder all the list with the new values , example

list= {
userA =1,
userB =2 ,
userC =3 ,
}
Remove One user (Button)

New list ={
userB=1,
userC=2
}

I dont know how handle the repeating group for this!

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