In addition to what Dom has mentioned, Rancor Collar won't do anything for weaponskill for samurais outside of the accuracy on it. Great Katana weaponskills cannot natively crit, so the +5% Critical Hit Rate on Rancor won't do anything for you. One of the elemental gorgets corresponding to Shoha would do you far better in that regard.
Lady Jinte wrote:
Vlorsutes' Negotiation Skill rises 0.2 points
Vlorsutes' Observant Parent Skill rises 0.3 points
Vlorsutes' Argument Diffusing Skill rises 0.1 points