Hopefully it's either a total loss, and he can wash his hands from it, or all the plastic, is removed for a proper inspection of all the subframes (Honda calls them "stays"), and all damage becomes part of the repair estimate prior to any repairs. If not inspected correctly, other damage is sometimes not discovered until much later.
That's pretty much what happens. Often the adjuster wants to write a check on the spot for any damage that is obvious. Everything else is "show me" and we'll settle up then. Because the mirror is damaged, its sub-frame that it mounts to could be damaged too. Sometime's the entire cowl, windshield, visor, and meter cluster has to be removed to see further damage. Obviously the rear subframe between the bags will need replaced. The valve cover should be removed and the cam, gear, chain, and cam cover be inspected for damage. If there is any cam cover damage, the head will need replaced. If the forward exhaust shield is damaged, it should be removed to inspect the header. Sometimes headers pipes get pushed in. Also, verify that the ignition still locks the bars. Sometimes a steering head gets tweeted. It's the unseen stuff that can easily push a repair into the "total" category.