Hello. Have you got the exact order of all the novels?
And regarding this: "I must admit, no other author I know of has this sort of greater collective multiverse that connects the MCs of all his works.", then you should also see the multiverse of Soul Land (it's not just Soul Land 1, 2, 3, 4 and 5 but also a lot of other novels). Some examples are that
(the protagonist of
) will meet with the protagonist of Heavenly Jewel Change at the end of Heavenly Jewel Change (you can see this in the title of the last novel chapter). Also, the novel Child of Light also is from the same multiverse as Soul Land but the protagonists of the novels mostly meet up in
. There is the list of novels from this multimerse: https://en.m.wikipedia.org/wiki/Tang_Jia_San_Shao
