He looks good! He is coloring up well. He does look like he is outgrowing his clutchmates, probably because he has been singled out. I wouldn't worry about him overeating during his growth period, that is more of an issue with a mature chameleon which can lead to obesity at that point or may cause females to produce an excessive amount of eggs. He is beginning to show the rostral process of an ambanja. Since you are cup feeding, moving him to the larger cage should be no issue. Just misting more often in the larger environment for humidity and hydration. Keep up the good work!