From what I can tell alot of his philosophy seems to be built around Malcolm Gladwell's book Outliers.
https://en.wikipedia.org/wiki/Outliers_(book). Namely "10,000-Hour Rule", claiming that the key to achieving world-class expertise in any skill, is, to a large extent, a matter of practicing the correct way, for a total of around 10,000 hours. This book was all the rage about 10 years ago, especially in the US. Most of the subjects/examples highlighted in the book are Americans. Some of the content has been seriously debunked since, but I'm guessing alot of the ideas still underpin what Ole do. Seems a fair number of the Ole staff after all, are well educated Americans.
I'm sure others on this thread or elsewhere, have debated Declan and Ole in great depth. Some on here are no doubt involved with Western Suburbs, or have even sent their kids to Ole. My take from listening to that 1.30 hour interview -
He is passionate about NZ football. Firmly believes there is no reason why young NZ players can't compete with world's best, whilst playing an attractive style. Thinks this can all be achieved in a NZ context, without much foreign help. So think even before Schmid or Heraf uttered a single word, he would have disliked them.
Likes an agrument. But you better come prepared. He's an avid reader, pretty articulate, and if you say even the slightest silly comment, he will jump all over you and tear that comment to pieces. Nil tact, and you better have a thick skin to last around him. Obviously has zero time for playing the political football game, and I imagine many administrators, and other coaches he despises.
Doubt he would succeed or last, coaching a senior side, where it is all about the results here and now. He likes being given a long term project. Also adults are more likely to question his methods, and that would just lead super quick to an almighty dustup. He probably knows that. He's better off coaching young kids, who won't question his methods, know that his track record now shows their highest chance of being a pro footballer from NZ (if that is what they really want to be) is going to Ole. He could end up at a big club (whatever that means) one day as an Academy coach, but again it's his way or the highway, so it's just as likely to end in tears if it happened.
His best route is likely when a small club like Torslanda, that have understanding patient ownership/board with a long term vision, not fixated on short term results, and basically give him total power to do whatever he wants. I imagine to a point Western Suburbs was a bit like that.
I think he's genuine when he says he gets a huge amount of satisfaction from seeing young kids grow over many years. Growing not only as footballers, but into other spheres like education, onto to uni etc. Not every kid going to Ole is going to become a pro. Of course at the end of the day he is running a business. Without kids (and their parents) signing up to Ole there is no business. So he needs to sell the idea that Ole produces better people, not just better footballers. But he started this whole thing with little money, and just a hard core of 10-15 kids in Tauranga/Hamilton who wanted to be better footballers. He just seems to have started out believing there was a another way of coaching, and the traditional NZ football system was failing these kids - nothing more than that.
Not one for sitting still, and always looking for continuous improvement. Open to new ideas/methods. Some make sense like breathing techniques, stressing the importance of a good sleep (esp as we now live in an age of taking digital devices to bed etc - which is shark for sleeping) - and others like hands off physiotherapy seem wacky.
Overall Edge is great for the growth of NZ Football, and player development. However it's likely just be a disaster to have him in any serious role with the AWs. Maybe U17s or U20s as an assistant, but his bias/affection for any Ole contingent would just as likely cause dramas. Ditto any involvement with Weenix Academy, and likely clashes with other coaches, and senior players. Get the feeling the lack of Ole grads looking at the Nix as a career option, is an insight into Declan's views on the A League as a whole, rather than just what the Nix provide. It's all about Europe, or a college path in the US.
He's probably best suited to doing what he currently does. Running a quality private academy in NZ, always questioning the status quo, challenging the hierarchy, making other people think. Also see the value of what he is doing in Sweden, providing a support base and network for young NZ footballers as they try to 'crack it' in Europe.