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Good defenders are able to read the game like a book. Good defenders are quick. Good defenders are whistle-clean in the tackle.
Great defenders are all of those things.
While it's far too early to burden Reid with potential greatness, you can only look to see if signs of those attributes are there.
The signs are encouraging.
West Ham has never been famed for their ability to keep the score down in their recent Premier League history and the main area of concern for boss Sam Allardyce on promotion, was tightening things up at the back.
With Reid at its heart the Hammers' defense began the season with three clean sheets in their first four games.
A promising start turned into an excellent first two-and-a-half months as by mid-December West Ham had one of the best defensive records in the division with only one team, Stoke City, able to claim more shutouts.
So positionally, Reid has been on the money.
There have been inevitable dips and it has been a lot tougher away from home where the Hammers have struggled all over the pitch, overall Reid's performances have matured.
Reid is also one of the quickest defenders around and that's official.
In the Hammers' home game with Norwich he was clocked at just over 23 mph (via EA SPORTS Index) making him the fastest in the division. He is clearly eating all his greens.
In a division where you're regularly facing the likes of Gareth Bale, Aaron Lennon and Theo Walcott, that comes in pretty handy.
As far as his tackling goes, Reid is putting in plenty of practice.
No-one in the West Ham back four has made more than his 51 this season. Although his yellow card count could be better, he is working harder than anyone else.