In sellacious finder results, results are the same as they are in the product list view. If you have enabled to show the products for every seller separately, they will show separately. If not, only one product will show and at the cheapest price.
This is the logic we follow in the finder.
If any product is in a special category, it will get the first preference
If it has a cheap price it will get preference.
out of stock products has low priority.
I hope this helps.