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It takes a truly unique talent to walk into the NFL and excel from day one.

Expectations are usually unrealistic for most rookies. They're often asked to succeed early in their careers, yet rarely do.

Years ago, an NFL scout imparted a bit of wisdom upon a fledgling writer, "It's amazing any of these young men succeed due to all of the mitigating factors at play."

Talent evaluation is often more intuition-based than scientifically driven. After all, these are individuals adapting to new situations.

Many questions need to be asked and answered.

Who is coaching these players? What system are they in? What are they being asked to do? Are they picking up the playbook? How are they adjusting to life off the field? How is their transition to a new city? How is their family doing?

Usually, the answers have a direct correlation to a player's success on the field.

It's nearly impossible to predict an individual's success when placed into a vacuum, but it's easier to do so when considering his overall situation.

For example, 13 players named in Bleacher Report's Regular-Season NFL All-Rookie Team Predictions also appear in this year's midseason all-rookie team.

Some players are simply placed in situations to succeed, while others are not.

Bleacher Report's eight NFL writers identified which rookies had the best start to their careers at their respective positions through the first half of the 2015 season...