Tyson is 5 foot 11 and 1/2

Loads of people have him as 5 foot 10 for some reason though... Probably due to his crouched he fought.

I've seen plenty of tale of the tapes have him as 5 foot 11.5 and a year or two ago my brother (who is at least 6 foot 2) got a photo next to him... he only looks a shade taller than Tyson.

But your point is true, De la hoya is only slightly shorter than Tyson... but he could never get anywhere near Heavyweight, not in 100 years.