I have enough hard-learnt history with horses tying-up and with stomach ulcers to know the best feeds are the ones you prepare yourself. A lot of work but it pays off. And the grains and grasses to avoid. A very good article to read. I would suggest PP, while recognizing the points made in this article, still has his tongue in his cheek. The feeding regimes mentioned iin the article go a long way to promoting gut health. Any horse that doesn't suffer from ulcers or any form of internal bleeding will live up to their potential. Unfortunately, a lot of those issues go unnoticed and the poor old horse is accused a non-trier or just no good. This is where the top trainers and ordinary trainers part ways in their thinking.
I am in no doubt Grimson and his contemporaries are good feeders. But I am also aware that the turnaround in fortunes of some of the horses he has rejuvenated cannot be achieved solely on feed. For one, the period between change of stables is not long enough to "perform miracles" and, in many cases, horses have come from good stables that are aware of the issues raised in the article and would not have a single-item menu for their stable.