There needs to be a bit more clarity.

There still is a partnership?

The partner that stepped away wasn't bought out by any other partner or the partnership itself? What happened to their share of the partnership, then?

One partner cannot sell the partnership assets if the partnership owns the assets. Or, the partnership first distributed/sold the assets to this one partner, who then sold them as an individual?

How does the partner "that sold" also still own "very little" interest? What did this person sell? What did they retain? Who did they sell to? What did they sell? Which partner is this: the one that stepped away, the one that sold something not belonging to them? Object and subject are a bit confused, here.

You stated the partnership name was sold, but does that entity still exist? The Partnership continued operating under a new name, or formed a new partnership or is dissolved or dissolving or no longer in business or?