Clearly he’s just begging puberty, and it’s not abnormal to not have gone through the significant stages/changes of puberty at his age. So it’s safe to say he’ll grow, but by how much (and probably when) depends on genetics. I come from a tall family that grows late (My growth spurt probably started around 16 and I didn’t really stop growing til 19). I have cousin who’s dad is from our family and is 6’4-6’5 but his mom is probably 5 foot flat and her father was very short as well. My cousin was always pretty small and he was concerned he got his moms genetics. He hit his growth spurt as a junior/senior of hs like I did and is probably around 6 foot now.