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Ian Walton/Associated Press

Foundational building blocks are never easy for NFL teams to find.

Sometimes front offices don't get the right players often enough to ensure sound roster construction. Finding a superb young offensive lineman is great, for example, but if the quarterback he's protecting isn't above-average, it might not lead to success.

The following teams have found their young core pieces (25 or younger) in the proper areas. These outstanding players at premium spots have long careers in front of them and have already shown the flashes necessary to inspire confidence.

That makes overall roster construction over the long-term easier on the front office.

Paired with the rosters around them, they are in the best positions to succeed over the long term. This doesn't imply the front offices will continue to smartly build around their cores, but they've at least established blueprints for success.