he was an officer like oven perospero and daifuku
Then, there is Shiryu who is above all of them.
Even if we assume that Raisin is a good swordsman, ignoring the superior ranked Amande and Smoothie, how does a cheap shot help you prove your point? Do you expect the entire fight to be made of cheap-shots? What if Shiryu or even Raisin cheap-shots Sanji? All it takes for swordsman is one clean slice and the fight is over.

Yes, it applies to swordsmen as well but there is something obvious that prevents them from being cut, their own swords which they use to block other swords. What is Sanji going to use to block the swords with?