Quick overview at this moment:
Use this list as a starting point to see if you can find other links between them. Do not use my list as absolute proof. It is very common for two users to use the same IP at one point or another; 364 users have used the same IP as master-p, and the vast majority of them are not the same person.
Some of them seem to trade in the same goods (CS:GO skins, steam stuff, bitcointalk/reddit/etc accounts) and frequently trust "each other" - so I am sure there are much more "links" then the above listed ones. Obviously not every "link" is proof though.
Be free to quote/update/etc.
I took a moment to check my escrow labels with this list of usernames. Since i noticed before that i had a trade with master-P involved and me as escrow where he bought a steam acc on 20150627. I asked the seller about it but did not receive an answer in many days now. The seller was iflewtoday32.
iflewtoday sold an amazon account on 20150415.
IronMarvel bought something and the seller might know his address in case it turns out he is really master-P.
I don't have details about the other users i think.