But I like to think it was just cut for time and he was supposed to be related to Grant.
That's probably the case. Rippers have found Hammer's dialogue in the text dump indicating he was supposed to have joined. Although I don't know if they looked through the audio files.
Julius : You. Why are you here?
Hammer: Why? I'm here for Soma! My man's in trouble, I tell ya!
Julius: But it's of no concern to you.
Hammer: Heck yeah, it is! Soma's my pal, after all. Laying his life on the line for a pal... That's what a man does.
Julius : Wrong. An ordinary human is no match for a foe like this. Being a man has nothing to do with it.
Hammer: Hey, bud, I served in the military! I know weapons a whole lot better than you! And I'd like to think I've got enough sense to retreat if it gets too crazy.
Julius : Fine, then. But if you ever fear for your life, get out immediately, understood?
Hammer: Loud and clear. You have my word.