Current Guideline:
The number of maps by any mapper should not exceed the number of maps by the uploader: this means that if you have 2 diffs, no guest mapper can have more than 2 diffs; collaboration maps are exempt from this. Ask a BAT if you're unsure of who should upload the mapset.
A map's uploader must have provided more content towards the mapset than any other single contributor. This means that if you are to have a collaboration mapset, you must have mapped at least one difficulty fully, and no other mapper mapped more than one difficulty (Taiko difficulties count as a difficulty). In cases of specific difficulty collabs, the uploader in question must have provided more content than any other contributor. (i.e. uploader maps a seperate difficulty on top of collabing in said difficulty) This rule need not apply for approval mapsets which may include single-difficulty collaboration. Storyboards do not count as "content" towards this gauging.I wanted to throw in something about "Consistently mapping only one difficulty of each of your ranked maps means you're a lazy smut" but couldn't figure out how to word it politely.