No, it may give him the best winning percentage (I have no idea if it does, but I'll accept what you say) but it doesn't make him the best coach. National team games aren't fungible.
I was explicit in qualifying that it was in terms of winning percentage. Debates as to who was the best coach based on factors other than winning percentage are separate fair game.
DiCicco has a record of 105-8-8 (the Wiki entry doesn't include two wins against Australia from 95), so his winning percentage is higher.