As my previous post I showed you multiple client rulers after a Lvl4 was destroyed, I now know why. If you have a full stack in the city and then build a government 4 the client ruler is manifested outside of the city. If you end your turn and leave him outside of the city for 1 turn he will lose the client ruler trait and just become a regular general on the field. Thus when I had destroyed and rebuilt that lvl4 in the other post it was after I had already skipped/gapped 1 turn and thus the second general had lost the Client Ruler trait and had not been deleted.

Idiots Guide to Level 4 thread for past reference