When placed on the upper level of his two-story cage, initially, he did not use the branch to return to the first level. Mainly he sort of dropped to the floor.
However, a couple times after being placed on the upper floor, he realized that the branch was a big help returning to his sleeping area. He nibbled the branch a bit and certainly seemed to appreciate the smell of it.
Several times a day, I am waking him and letting him navigate a large tray in which are interesting objects. His muscles are becoming stronger and he is more certain when he crawls.
I really wish I could get a buddy for him because I think he would learn quickly through imitation.