Remember, it's not "going beyond the constitution" - that's not allowed. It's assigning people as Circle Members who are not required to be Circle Members, which is within the constitutional authority of Lead Link.
And yes, a Lead Link could use that to invite a non-partner role-filler to be a Circle Member (a non-partner would normally not be one, even if the lead link assigned them to fill a role in the circle). A Lead Link could also use this rule to invite someone to participate in governance and tactical for awhile before assigning them to a role, so they have more context to find roles, or perhaps so they have the context to find opportunities for Individual Action. There are probably other use-cases as well.