That is an assessment of past performance in other offensive systems. Past performance does not necessarily predict future outcomes.No question-- between Leary, McCall, and Mertz Mertz is easily #3.
Mertz was widely recruited out of hs and had big offers. He has excellent size, arm talent, and multiple years of eligibility. Wherever Mertz goes, he has a chance to do more in a different offense. You never really know what the future holds.