Actually, everything links with it's same type of empty. so weepers won't link with carvers or wanderers, but they will link with each other. even though they are all "empty" it's like pulling a rabit next to mandy.
Nothing links, at least on the first floor. I duo farm promys a decent bit and my partner will pull empty from a pack of empties of the same type easily.
thats not true earlier today me and xellith were farming and tested it... no links at all wanderer on wanderer... everything... no links at least on first floor