in another artist (i think big g) mentioned how important it is for babies to start moving in rough terrains to increase their feet toughness, he also did an abuse and cut the feets and gave him new ones, and the new ones were weak as in not trained but given it had bigger mass than when it was a Ko, the yukkuri was able to train it way faster, so yeah what i am trying to say, bigger yukkuris can move around way more than young ones in a more logical way
This world runs on
Survival!
Of!
The!
Fittest!
Je! If your willpower is lukewarm like that, you won't even be able to survive, je!What yu can and can't do is not the problem, je!You just have to do what has to be done, je!