I think Bradshaw and Ward are very different...The reason it works with the Giants is because all three backs bring something different to the table.
Jacobs is the smashmouth running back, Ward is the most balanced and is a good pass catching back, and Bradshaw is the fastest, most electrifying of the three.
I don't think Omon is a bum but I can't see him running harder than Marshawn or catching passes like Fred, and he's definitely not faster than either of them.