Who are they?
Who are they?
And the question becomes more complex when you realise that poker isn't just one game and you need to consider NLH vs PLO vs mixed, heads-up vs 6-max, cash vs tournaments. Some people specialise in a variant, others just play everything.
Of course there are other specialists above their competition in every variant ; my point remain, though, that the level is much better now, and would we analyse the plays made by Stu with solvers, we would find lots of mistakes made. (Actually I will probably do it for fun).
My point being, Stu was incredibly dominant in his time, and props to him for figuring out so much about the game especially back then, and that's a feat just for itself, but other players are incredibly dominant now too and with a much better understanding of what they are doing.