It was only a kidney. That isn't all that large and once removed it's quite possible that he dried the blood on it - with the apron - and simply put it in his pocket. He cleaned his hands, also with the piece of apron. Now he has a piece of bloody apron (I don't think the size was specified) which he doesn't want to pocket because he doesn't want blood from it on his clothing. He therefore throws it away in the first place he thinks it'll be reasonably hidden from immediate view e.g. in a passageway that's unlikely to be used for a few hours.
There is absolutely no justification - whatever - that the Ripper wrote it. None. Zero. Zilch. There's no link between the graffito and the murders. There's simply a coincidence that the piece of apron was found where some graffiti was.
All the best
Dave
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