He doesn't need to know, it's his deus ex machina...So if Ichigo can master his ressurecion then he'll be able to control that crazy hollow mofo? Cool. The only problem is I don't think he even know he has ressurecion.
Okay, sure, but if he can actually control it then it will be all the more powerful. Not to mention he won't just go around destroying everything.He doesn't need to know, it's his deus ex machina...