//...he would have ignored the advice and left the building regardless of the advice to stay from the fire service operatives at the scene.//
If he had been above the fourth floor he would not have made it. The only stairwell was acting as a chimney and was full of dense, toxic smoke. Two breaths in that atmosphere would have rendered anyone unconscious. The only survivors from the higher levels had been led out by firefighters who shared their breathing apparatus with those they rescued.
There was a firefighter on a radio phone-in this morning who had been one of those who had rescued people in just that way. Apart from the problem mentioned above, there was no possibility of people of mixed abilities safely descending from as high as twelve floors in a single dark stairwell (even without the smoke) without major problems caused by panic, falls and trampling. That gentleman's first hand account somewhat makes a mockery of the recent findings by the inquiry (which suggested the "stay put" policy was flawed) and trashes JRM's ridiculous comment. It also casts some doubt on the sagacity and widespread knowledge of one of our more learned correspondents in this question last week:
https://www.theanswerbank.co.uk/News/Question1680781.html
To save you searching through the 200-odd answers, I'll quote you a few passages:
//Ultimately, they told people to "stay put" in a death trap, which was clearly evident from approach.//
//If a building is on fire, you get out. Basic knowledge.//
//That's what happens when you blindly follow authoritarian figures.
Always do what you personally think is best.//
//I've actually had training on such topics, so no it's not nonsense. It's common sense. Something that lacks here.//
I notice JRM has issued an apology.