IMHO and very distant view, the Bright Trading acting CFO lineage is most likely something close to this:
CEO Bob > Bob>Tammy > PRES (& acting COO!) Tammy > Tammy/Bob>Christy > CFO Christy.
According to those who work with her on almost a daily basis, newly-named Bright Trading Chief Financial Officer, Christy Bright-Ross, is very astute also as trader.