Intro
Maulvi Abdul Karim was on of the main ghost writers of MGA, as well the speech-man and salaat-man at Qadian.  In Ahmadiyya sources, you will never find a full and complete bio for Maulvi Abdul Karim.  And for good reason, the con-job of Ahmadiyya would then be exposed.

MGA in Sialkot
When MGA ran off with his fathers pension money and was punished by having to work, he was sent to Sialkot.  MGA lived in the Mohallah Kashmirian while in Sialkot, co-incidentally, Maulvi Abdul Karim was born and raised in the same neighborhood (see Basharat Ahmad, Mujadid e Azam, page 60).

Conclusions
MGA had a deep relationship with all of his ghost writers.