One improving in the morning, one coming last

• Change maker
• Editor, at times
• Copyreader, e.g.
• One changing a bill
• Copyreader, e.g
• One proposing a rider to a bill
• Maker of a change or revision
• Unexpectedly named by Queen, one changing for the better?

Wiktionary Word definitions in Wiktionary
n. One who amends.