I don't have specific info on your Guss family but would be glad to check our records if you think any of the siblings of Nicholas Guss stayed in Jasper County, IN and you think there might be any records of them here.I'm not exactly sure what info you're looking for.
I'm not a Guss or Cooper descendant but several of my ancestral lines have Cooper connections.I also wanted to ask something about Emily Cooper, you show her as Emily, John Cooper's obit lists her as Anna.Do you know if Anna was one of her names?
I know your Emily's sister Sarah was married to James McCleary, we knew some of that family from later generations of course, and Emily's sister Abigail married a Call, the Calls are connected with my Hurley and Burget families.So there are lots of indirect connections here, some I probably don't even know about yet.
Two of us researchers also think that Anna Burgett, wife of George who came here in the 1830s, was also a Cooper and likely was John Cooper's sister, this Anna was born in NC also. An Anna Cooper married a George Purget/Burget in Madison County, OH in 1826 and that's where John Cooper was married also.
So sorry to say I don't have anything now to help on the Guss family but would be glad to look when I get time if you'd like.