Against it is that you won't start it and will fly from the left seat. But he that fly's gets PIC
So in a two pilot operation you decide who is PIC after you get back?
If an instructor doesn't touch anything does that count as solo?
Now call me old fashioned, but I would have thought that you decide who is PIC before you get in the bloody thing and the PIC sits in the pilots seat. On the right in this instance.
I would go as far to say that to log time in the described manner could be construed as falsifying documents.
In CRM the R does not stand for random.