[@TheMagician] Can't see anything egregiously wrong, but there are a couple of things that could streamline it. 

Firstly his history - we're in a period where the only living Cadians would be those found on Cadian colony worlds, those that saw Cadia burn either being vastly old or dead. Also, why the connection with Fenris? Why not just have him fight alongside the Wolves against the Sons on another battlefield?

Secondly, while Cadians are excellent infantrymen and specialists, things such as Basilisks and tanks take particular training - so unless Hamilton trained as an artilleyman or tank operative, that's a bit much to shove in his skill; being good with various forms of hand-held weapons, that's fine.

These things excluded, all seems pretty good! Has what I've pointed out make sense to you?