No way is there only as 6" height difference though. It's at LEAST 10 inches! I reckon his son is 6 ft 4 to 6 ft 5, and Gary is 5 ft 6. I am not buying the 6" difference.
But where would the 6ft 2 figure have come from if it’s wrong? Very few men pretend to be shorter than they are - especially if their heights are being discussed in the press when they’re not even famous. I can get that Gary Barlow might add an inch or two, but his non-famous son claiming to be shorter? Why?
I think it’s VERY hard to tell the exact height difference from a photo. People underestimate what a six-inch difference (for example) looks like until they see it close up. Take it from a tall woman who’s been told more than once that she must be taller than 5ft 11 “because I’m 5ft 5 and no WAY are you only six inches taller than me”.
If Gary Barlow is more 5ft 6 than 5ft 7, and his son is on the high side of 6ft 2, that’s nearer to eight inches - plus in the original pic, Barlow Jnr has noticeably high hair and quite big shoes. I don’t think there’s a ten-inch difference.