Forged signature is worse for Rather of course, but even an "authentic" sig doesn't help him, as he has admitted he was working from copies, which could have easily had photoshopped authentic sigs.
The fact that they didn't copy a signature is interesting, but it does cement any accusations of forgery.
The creator of this document at least knew they had to create the signatures, but it looks like they failed. Signature forgery aught to get the forger a few years in the clink.
I think the Killian signature is a cut and paste copy