Some progress, but you should read those Wiki articles more than once and experiment with how [Album Artist (auto)] works.
What you have done to fix "A Nod to Bob", while it looks correct, is actually wrong.
Basically, by entering "(Multiple Artists)" into the [Album Artist] field you have told MC that there is one main Artist for the Album, and his/her name is "(Multiple Artists)". MC dutifully copied that name to the [Album Artist (auto)] field. But it thinks there is only one main Artist for the Album, and if there are multiple values in the [Artist] field for some tracks, that information isn't being used to determine this is just one Album with multiple artists.
Hence, MC marked the [Album Type] as "Single Artist (complete)". That single artist is named "(Multiple Artists)". Strange name for a person!
I'm not going to reproduce the Wiki article, but what you should have done is move all tracks for the album into the same directory, make sure the [Album] field is the same for all, left [Album Artist] empty, and MC would have put "(Multiple Artists)" into the [Album Artist (auto)] field for you, as long as more than one Artist is entered in the [Artist] field for at least one track. or at least one track has a different Artist to the other tracks. This even works if you have tracks for multiple albums in the one directory, although I prefer to have all tracks for an album in their own directory, with no other tracks or albums in that directory.
Once I get these types of Albums correctly identified as having Multiple Artists, I tend to move them again using the expression \[Album Artist (auto)]\[Album] so that they are all grouped under a \(Multiple Artists)\ directory. I can find Tracks for the various artists in these albums using MC's search capabilities, so the files don't need to be stored under a directory named for the Artist. After all, which Artist would I put them under, if there are multiple?
So when do I enter something into the [Album Artist] field?
Well, consider Queen's "Greatest Hits III" album. Six of the seventeen tracks have more than one artist, including Elton John, David Bowie, George Michael, etc., and one track is just Freddie Mercury. But I want that album to be categorised as a Queen album, and not a multiple artist album. So I enter "Queen" into the [Album Artist] field and all is good. The [Album Artist (auto)] field is set to "Queen". I can still search for "George Michael" tracks and MC will find the track in which he sings on Queen's "Greatest Hits III" album.
Easy really. Takes a while to clean up lots of old files. I know, I still have a mess to clean up on my HTPC!
Enjoy!