this was discussed when mini's and their cot reports first came on the scene, and the conclusion was that what was called a 'commercial' in the minis was in fact a 'small spec' in terms of the large contract
perhaps the cftc has altered the way they started in the reporting over the years, but here's a link agreeing that you can't count on minis to make a hypothesis:
"Do you include the E-mini contracts in your COT analysis?
Yes, we do give weight to various mini contracts in formulating our forecasts, but there are differences: Each standard S&P 500 futures contract is sized at $250 time the index. If the S&P is trading at 900.00, this means that each contract is valued at $225,000. The large trader reporting level for the full-size S&P 500 futures contract is 1,000 contracts, meaning that the minimum holding of a large commercial hedger is $225 million. Compare this to a mini contract holder, where the contract multiplier is $50 and the reporting level is 300 contracts. Here, holdings of just $13.5 million qualifies as a "large commercial hedger," but these would be included in the "small trader" category if they were trading the full-sized contract. Obviously, at just 6% of the position size, the mini commercial is a different animal than the commercial who is trading full-sized contracts. Because of the short history of E-mini commitments data, it is too early to make firm evaluations of the usefulness of this analysis. Meanwhile, the full-sized S&P 500 contract, which enjoys the longest history, continues to provide extremely timely trading advice."
http://www.insiderca...llishReview.htm
sentimenttrader made nice posts elsewhere when SPX was down about 1375, saying the big contract SP commercials had covered their large short, and that bullish call turned out well
on NIKK, the number of contracts is so low it doesn't matter
commercials are about making money, they buy low and sell high, not just 'hedging', and in the other commodities they can let a market go against them for months while they build a position
normally the large specs are opposite the commercials in everything, and finally the large specs(who've made money earlier in the move) capitulate and the commercials win