For the record, Coach Manning's reportable compensation (i.e. salary) for FY 2016 was $1,712,884, according to WFU's IRS Form 990 (available at guidestar.org). His "other compensation" was $38,144 (usually most of such "other comp." is retirement contributions).
For the sake of comparison, Coach Clawson's 2016 salary was $1,789,226 with the same $38K in other compensation.
Given those facts, it seem unlikely that Coach Manning's salary would have increased to $3M per year when he was given a contract extension.