first pass at guessing: sanguinity for "Something Good (Will Come From That)": among many other superlative details, the much-appreciated source list/credits was a giant clue, along with the inclusion of Bert Coules audio. I suspect k_e_p might be the collaborator...

k_e_p or gardnerhill for "Bee Yourself": I need to review the other non-BBC works to make my final decision between them. The length is not a sufficient aspect to identify the former as a candidate but it helps (affinity for Elementary, Elementary's bees, and Joan are the greater hints), while a history of crack bee Elementary fic points to the latter...

I think this may be the first Holmestice since I've been aware of the exchange that's had a MoreHolmes gift every single day of posting (and even more than one!). Thanks to all the participants and the mods for making that happen.