Strength, Size and Power is a good tool, and an important one. Just remember, that as we get older, the law of diminising returns and old age takes effect.
Carl Cestari is a fairly big guy and can blast a fist sized whole through anyone.
from his years of training, He is still very strong in his delivery. That is from skill.
In training in Tai Chi, Sigung Hsu Fun Yuen is not a big man, However, he can deliver incredible power from his frail frame to repuse even the biggest of his grand students. That is definitely skill, True kung fu!
Work both powerful execution and skillful execution.
A strong powerful person with good amrtial asts skill is a dangerous martial artist.