MIAMI—College football’s latest super hero is a square-jawed, brush-cut, almost-too-good-to-be-true 21-year-old named Tim Tebow, who can dazzle a full college stadium by day and still make time to preach the gospel in front of a packed prison auditorium by night.

But NFL scouts will tick off a laundry list of his flaws at the drop of a helmet.

Tebow isn’t tall enough to play quarterback at the next level. He throws left-handed, and side-armed, besides. He runs too often, gets hit too much, rarely calls his own plays and has taken every snap from the shotgun formation fo...

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