What if Tup served with another legion before the 501st?

Tup was assigned to the 617th Legion who serve with General Pong Krell. They are deployed to the planet Telnerth to drive out separatist forces. A month later, the 617th Legion is disbanded and Tup is transferred to the 501st Legion Torrent Company. Torrent will have to befriend a battle scarred Tup before he can do something drastic.