It is more than likely that he will be growing more in the next few years, fingers crossed they work through it.
Stephen was listed at 154cm (about 5'0") last year. So yah, while not 7 inches, it's still pretty substantial. He's likely still growing too. It also looks like most of the growth happened after Jr. Worlds in March, likely in the summer, since I don't remember him being as tall as now. So it's also within a relatively short period.
He looks great with that Californian tan and very bright hair.
I wish his skating has been looking equally great, but he's still in transition, without the doubt.
Btw, it was quite sweet seeing how supportive Raf was. He gave Stephen a smile when he came off the ice and was being all around encouraging in the K&C. I always had the impression he was a strict coach, so it was nice to see him giving Stephen support.