The skills that Walker gained to help him control the golem bodies all worked together in their own ways.
He had used them and accepted them more as a part of himself rather than as skills to manipulate actively. While that seemed a little opposing to what he was doing, it worked for the ways that he interpreted the skills and the feelings he received from the golem bodies.
However, if he was making used different elemental puppets, then he had to keep in mind that he could control them actively with more mana manipulation and the skills he has gained.
Therefore, Gil has seen a chance to get Walker to train those skills while also helping him train the archery style in slow motion.
Training anything in slow motion was ideal for the person training.
