No problem to add multiple skills to an attribute. The problem is I don't see why only this option would add 3 skills to the attribute. And it doesn't work like the classic gymnastic dodge, since we see that the gymnastic dodge doesn't allow 3 skills.
It's always one attribute plus two skills, actually it's the classic defense option (so one attribute against ranged attack, one attribute plus one skill against melee), plus one skill when you choose full defense. The second skill added can be dodge, or a weapon skill, or gymnatic, one of these three, but never two