Some people have slight obsession for full ranks. I don't mind having uneven units if it is advantageous for my play. Wouldn't it be more suprising for your enemy if you place your combat character into unit of 25 men instead of 24?
Anyway, I think your observations are valid. Character deployment is an important factor one should keep in my mind when deploying other units. The longer you can preserve your options the better. Also, your opponent can turn his emphasis completely on other flank with characters, and you should be ready to counter this.