I do like the theory, or alternatively it is a tradition that proved to be very useful to each Grimm who inherited the previous owners journals, so it reinforced the behaviour. However, I just checked the first episode and Nick starts to do a drawing in his notebook whilst in the hospital after the attack on Marie before he truly knew he was a Grimm and even about the 'books' so it would seem to suggest the behaviour may be linked to his newly emerging Grimm abilities.
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