No I most definitely don t think we could, and I'm surprised anyone who's presumably followed the game for over 30 years genuinely believes they could do better than someone who's been a pro footballer for years, worked with top coaches, then been a coach with badges etc.
I fhibk you're seriously underestimating what's involved bringing it all together. We can all pick out some things that could improve, but making it come together v other pro managers is another story.
Like Rob said re art, bit like people claiming tgey coukd do a better as a chef v top level chefs as they can source similar ingredients and follow s cook book.