I would support a temp ban + signature ban if you have no other instances of plagiarism. If you were not participating in a signature campaign at the time, I would argue for additional leanancy. This is based on your merit history (which implies your contributions to the forum).
Shall it obvious that plagiarism has it penalty but considering the fact that the account of MPG don't have any further plagiarised work i think he should be considered a temporary ban instead of permanent ban and after sometime or period of it's mistake punishment he can as well join a signature campaign, because looking at his account per say he really contribute immensely to the community.