I plugged the numbers into my own formula, and Sampaio comes out a little better than Ridder. Since IS, ID, and RB are the same for both of them...even though Ridder has the better SB skills, Sampaio came out ahead because of how much better he is in the rest of the categories. (I believe that no skill is completely worthless to a position...just less important to some.)
Although, I'm not sure exactly how important Experience is...I weigh it in my formula, but perhaps not enough, or maybe too much! :P Sorry I don't have a definitive answer for you, but I hope that helps a bit.