For me, it's all about the best player available (BPA) that fills a need for your team. The only exception is QB because the NFL is a QB driven league and you need one to win it all. There are a few exceptions like when you have a dominating defense like Denver did.
Can run stride for stride with receivers down field
Shows burst to close
Knack for jumping routes; instinctive
Physical on line of scrimmage; nice hands
Great feet and balance
Takes proper angles in run support
Comfortable in press coverage
Shows awareness in zone
Mirrors receivers well
Will take on a block
Lapses in concentration
Could improve form tackling
A little too high in backpedal
Must locate ball more precisely; might lack some vision
Occasionally looks sluggish coming out of breaks
Summary: Dowling has the physical traits to be a starting corner in the NFL and I love his competitive attitude. However, he needs better coaching at the next level, and if someone can perfect his technique, he could be a playmaker. Looks like a first-round talent.
Player Comparison: Ike Taylor. Taylor and Dowling have great size, athleticism, and the competitive attitude you love to see.