I have looked into this closely enough and I can confidently say that master-P has the following alts (this may not be an all-inclusive list):
So you're saying one of master-p's alts is IronMarvel. But IronMarvel2 is not?
I remember IronMarvel2 creating that account to say his original account IronMarvel had been hacked:
https://bitcointalk.org/index.php?topic=924237I remember this because I suggested to him about contacting BadBear which he did and regained control of his account.
I believe these accounts were both owned by the same person initially.
Is this another case of account selling on here

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IronMarvel got hacked early this (2015) year, then BadBear recovered it for him. Some number of months later he used his account as collateral for a loan a number of times, and the last one he defaulted and did not answer me for a long time, so I ended up selling it to AccTraderALT who I believe is an alt of master-P. The IronMarvel account was not hacked as of when I sold it, and I know this because I was in possession of a signed message giving me ownership of the account in the event of a default.
IronMarvel2 is the account that he used to communicate with me when he took out the loans that he did not default on