Askren has never beaten a top level WW, Aoki would get destroyed in a wrestling heavy North American market (see the Alvarez/Melendez fights), Tybura is entirely unproven against top shelf HW's (same for Ishi), and Moraes/Bibi have not faced anywhere near UFC level competition thus far in their careers.
Every fighter he listed in that category is a prospect except for Aoki who is a proven commodity and does not rank in the legend category. I can go run through fight finder and pull up dozens of fighters with similar records that are most certainly not legends because they fought sub-par competition when compared to real legends.
Don't go correcting someone else's post when you yourself are wrong, or basing your entire post on your bias towards certain figthers. Any fighter who hasn't yet made it to the biggest shows and beaten the toughest competition is a prospect, 40 fights in or 4 fights in.
Edit: PS - Calling these guys prospects is nothing like calling future UFC Hall of Famers and current champions prospects. They compete on the highest level, something his listed fighters don't do.