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No. It's just missing a tie around the saddle onto the topbox to hold it in, against bike.
The rear wheel is higher than front, so weight is all on the front forks.I did consider making another bracket off rear subframe to clamp saddle, but just not been needed, and more weight at higher c.o.g..
I tend to put wheels on topbox, or wearable wheel bag. Not mad enough to ride around with disc in rear of frame. I just took that photo when testing it, you'll see with eagle eyes the bracket is just tacked together.
skinny-
Ok, I can see it's fairly thick steel but I'd be inclined to make the bracket with a 90° bend instead of a weld, just an engineering principle of having a weld take the stress of the bikes fulcrum and vibration. Do you reckon the forks will be OK with stress perpendicular to how they're designed? Should be fine but I get scared with carbon witchcraft...
Don't mean to be negative btw, it's an ingenious fit, I'd just put some support padded bracket under the topbox mount that 'takes the weight' (i know that's probably only 6kg of biek!)
inchpincher
Is there another bracket I can't see that supports the weight of the frame at the back?