Col, welcome. In a very small nutshell, barrier draws as Kenny points out are over-rated, not to mention an erroneous statistic. There is approx 3% difference between barriers long-term. Obviously there is always a horse in barrier 1, but not always in barrier 16, therefore no statisical relevance can be taken into account. Tip: Use another filter for your ratings. There is, however, a cavet. This pertains to horses drawn an inside barrier close to, or on the turn. In this case, they are favoured and the outside horses/barriers are disadvantaged.

Hope this helps.