What do you mean? Should he have had low lats and worked them off?

No,  but when people are smaller all over, a lot of times you  don't notice shortcomings.  Like I've always had shitty calves, but no one noticed until the rest of my legs developed.  Even as a MUCH MUCH smaller man,  Dennis' lats were  noticeably still proportionately too small and high for his frame.