I got him to 182,5 cm (6' 0") with this image i.imgur.com/FeEYCxo.jpg since your image is of them sprinting, they would be crouched a bit, making the difference of their height bigger and somewhat missleading... edit: I now got Rex to 186cm (6' 1") by measuring from the back of their feet, this also made shulk 171cm like he is in xenoblade 1 but I think he should be taller than he was so Glimmer is probably just shorter than Pyra/Mythra which makes sense to me. btw, you did your chart from their toes on the bottom line when that is where their heels should be.
He out grew Shulk lol
I got him to 182,5 cm (6' 0") with this image i.imgur.com/FeEYCxo.jpg
since your image is of them sprinting, they would be crouched a bit, making the difference of their height bigger and somewhat missleading...
edit: I now got Rex to 186cm (6' 1") by measuring from the back of their feet, this also made shulk 171cm like he is in xenoblade 1 but I think he should be taller than he was so Glimmer is probably just shorter than Pyra/Mythra which makes sense to me.
btw, you did your chart from their toes on the bottom line when that is where their heels should be.