Overview
A barrier draw is one piece of the racing puzzle. Its significance depends on field size, distance, race shape, rail position and how the runner settles. Barrier 10 in a 10-horse field is not equivalent to barrier 10 in a 20-horse field.
Win rate and share of winners answer different questions. If barriers 1–4 win 10% of their starts, that does not mean they supplied 10% of all winners. Win rate is wins divided by runners in the group; winner share is wins from that group divided by all wins in the comparison. Only winner-share categories that fully cover the winners should add to 100%.
Settling position is usually known after the race, so a historical advantage for leaders should not be confused with certainty about which horse will lead next time. Use historical run-style data to frame a question, not to declare a result in advance.