AnswerS

From 2006.igem.org

Yes, it would be more beneficial for future use if we could enable the Hin to be turned both on and off.

The Cre/LoxP could be use to turn off (remove Hin). The IPTG/LacR (remember we need an inducer that must go away such as Lactose) could be used to turn on the Hin.