If you want i can help you with the data needed to answer the above points (beside the first since i don't have the information regarding the initial rank)
it's quite fast to do with the latest tool i made.
I also have a list of users id-name-rank updated to yesterday if you need it.
I'm still working on extracting the initial Merit airdrop per user, but moved on to other things before I completed it.
I have userIDs, ranks and names, that's all very easy to extract from the profiles.
I think I'll skip the "Total Merit received per Rank", it makes no sense to count Merit received in a lower rank for the current rank a user has.
The "List users who have "received only", "sent only" and "both sent and received" merit" can be extracted from the lists I have posted already, so it's not that interesting to add either. I think I'll clear most of my TODO, the only thing I really want to make is a weekly update of ranked up users.