He has the BYU record for completion % in a season, and is second all-time in yards per attempt in a season. Those two considered together might make him the best all-time.
He also has the record for the highest QB efficiency in a season (196.9). McMahon is second with 176.9.
Another record is TD/INT ratio (11), doubling Giff Nielsen's second place (5.33).
He's absolutely top four, and maybe top one.