Hi mb321,
I hope so too 
Spirit Sleep is a Zinus Brand that tends to use lower quality/density memory foam than I would be comfortable with. A forum search on Spirit Sleep (you can just click the link) will bring up more comments and information about them.
Bed Boss is another Chinese manufacturer that is also CertiPur certified but they tend to use higher quality materials in their mattresses than Spirit Sleep. You can read some comments about them (and other manufacturers that get their foam from the same foam manufacturer) in post #2 here and a forum search on Bed Boss will also bring up more information and feedback about them as well. As with any mattress purchase in addition to careful testing for PPP I would always want to know the quality/density of all the layers in any mattress I was considering.
No they aren’t related. There are several manufacturers with “American Bedding” in their name but I believe the one they carry was an independent manufacturer that was purchased fairly recently by Corsicana (see post #5 here). Dutch Craft is an independent manufacturers that is a different company completely. They are probably just using the same runner on all their mattresses but the tag would be accurate. Either way though … the information you need about the specifics of the layers and components inside any mattress to make an informed choice (see here) is always more important than the name of the manufacturer.
Some browsers seem to have difficulty with attachments (see the help tab here) but if it doesn’t work for you then you can always email me the picture you wish to attach and I can attach it to your post for you.
Phoenix