My guess is that they decided to spend more money on other parts of the toy rather than include a hook. Bear in mind that Hasbro will even omit a single paint app if it exceeds the toy's allocated budget. Another gripe I have about this toy is the light piping in the eyes. It's completely ineffectual. Even if it worked, it's clear blue, which seems an odd choice (for the sake of screen accuracy, it should be green). I'd rather just see the toy have painted eyes than having unworkable light piped eyes.

Also, I've posted some action shots of Lockdown here and here.