I love the MGS series to death, but I will entirely admit that Kojima is an insane lunatic in both the best and worst ways and I think is someone who needs a guy on dev teams to ground him and even probably just tell him 'no' sometimes. I think it's telling that for the majority of the MGS series he had Tomokazu Fukushima as his scenario writer, then the first game that he wasn't attached to (MGS4) was an absolute clusterfuck of ideas and insanity since Kojima was presumably left to his own devices.
That being said, the guy is such an entertaining lunatic and hype man for himself. I mean, just look at his Twitter; he's claimed to have 'invented camera', once explained Death Stranding to Mads Mikkelsen as 'two dinner plates, one knife' and claimed to have invented an entirely new genre of game with Death Stranding, the 'Strand Game'. What does that mean? The man is 100% an idea guy, so I wouldn't be surprised if the USB stick is just full of general and vague mechanical ideas without any meat really attached to them.
Love you, Kojima.