"Member Connect" does not "kick in" automatically when you add people to your tree.
The MC 'connection' is made if you ~copy~ individuals / families from others' trees via that avenue. Or it is made if you click to add a tree to your 'connections' from an individual overview page.
As you have found, copying from others' trees is not the shortcut to accurate genealogy that Ancestry.com purveys in its advertising.
There really is no substitute for step-by-step research in evidentiary documentation.