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At the end of his career with all his 1500 times and his 5000 times and a few 800s and workout data not really. But as you have mentioned, early in his career any difference could be masked by the type of training he was doing.
I think Antonio's description of how Silva responds to starting workouts too fast and the tactics he uses to run his best 1500s would tip his coach off. For an experienced coach, with other runners to compare too, it shouldn't be hard to narrow things down quickly with more supporting data each week.