Hill, of course, knew that the reason Russell was puzzled by Ulrich's actions was because the child knew he wasn't the real Ulrich.
In Russell's nature, there was a very sincere side, so he always felt that even though he only had brief contact, he could see through Gilbert's authenticity. So, shouldn't Ulrich, who was sheltered by Gilbert and utterly loyal to him, see it even more clearly?
That Ulrich, who grew up under Gilbert's protection and was completely loyal to him, had some behaviors a bit at odds with reality that caused Russell to be cautious.
However, it was precisely these actions that truly were Ulrich's.
That child, from beginning to end, his greatest wish was to let Gilbert live his own life... He always treated the family's apprentices well, even so fairly that his own children received no special treatment, because he hoped for someone in the family who could help share Gilbert's burdens.
