I think memorialize speaks to announcing publicly. There are other ways to prove contractual agreements if dispute occurs. A signed document just makes it easier to prove.
Reads like during the course of their partnership, more than likely, there will be plenty of evidence whether he worked as Scotty's management or not.
The 2% offered to manage Scotty by his mother is so 'lowballed' for the service that I can see it being evidence that his mother didn't deal in good faith, and, perhaps, never intended to hold up what is expected to be their part of the agreement. At least she could have made a more reasonable offer. 2% is unheard of and unrealistic.
Besides, Scotty is an adult now, is there evidence that he agreed to have her negotiate for him now that he no longer 'needs' her supervision?
'Stage parents' are an obnoxious part of the industry. Sure they are needed for younger artists, legally, but more often than not, they use the opportunity to draw some of the spotlight from their child onto themselves. Fame by proxy
How often have we heard the Reinharts say the decision is their daughter's? They have never interfered as far as we know, been there for advice if needed and don't even care to take any of the spotlight. In fact, it has been Haley that has drawn them to events. They live their own lives with pride in their children.
Humble through and through