You have to take into account the talent surrounding the QB compared to opponent talent too. Allen played at the top level of the NCAA, and had very little talent around him, while playing in the Mountain West against superior teams with superior talent. Lance played with the best talent around him at that level of NCAA, his talent was superior to teams they played against. It's much easier to make quick reads and get the ball out to receivers that are running open.
I could also use Jalen Hurts as a comparison with strengths and flaws. Jalen was a 65% passer in college, and his accuracy issues are apparent at times. He was successful with a high % because his teammates were superior to most of their competition. Jalen only completed 52% as an NFL rookie last year while removing Wentz as the starter.
There is no doubt that Lance has potential, but he has things to work on with accuracy being one of them. If a team is patient with him, they could see the rewards 2-3 years down the road, or he could bust in which he would join a long list of many.