I'm cool with the specific knowledge needed in the "burden" group; that's going to happen and is okay if it's not all members of the group. However, I think you really need to stick to one kind of connection in a group. Either the connecting work is appended, or it's prepended, or it's a definition, or...

IMO If you have to say that all items in a group have "some connection to" a key word, that's a sign that the connection is too loose.

Burden group.fine imo. Less keen on "The". Sticky better?

"The"? seriously? "The" can precede anything.