Wilson, Vick and Brees all should have official measurements taken and recorded at the combine. Young has never been "officially" measured. I visited the Alabama website and found Young was consistently listed at 6' and 194 lbs for his freshman, sophomore and junior seasons. This is abnormal but is undoubtedly where the Wikipedia iinformation is from. The combine will clear this up.
Also, with Wikipedia, there is inconsistency. At the top under personal information, Brees is listed as 6'0", but further down under professional career, the official combine measurement is 6'0 1/4". Vick is 6' and 6'. But again, Russell Wilson is listed as 5'11", but has his official combine measurement listed as 5'10 5/8".