Well the amount of reasonable/expected decline in defensive skill at 25 years old, with no debilitating injury, is very small. Actually, players should still be improving at 25.
http://assets.sbnation.com/assets/625887/feilding.jpg?_ga=1.138826931.1292300710.1445115791
I don't know what the reasonable amount to "chalk up to noise" is. But we know that one season of UZR isn't a stable measurement of skill.
Make your own conclusions about likelihood. We saw Lawrie play defense every day for a few years.