I sort of wonder about this because of that Jeopardy guy James Holzhauer and his incredible ability of consuming an unlimited amount of information and his recall ability. Add to that superior knowledge and common sense and a person like that would be great in speculating. 2nd to known.
Who is good in speculating have a nice winning rate, simple as that. How do they do it? They have a great analytic skill, they have the ability to process the info they collect everywhere around. Not everyone can do it, but many will try to have a winning rate in trading.
Can one have expertise in speculating, yes! If he is deep inside what he speculating about! If he knows how things work and where to look for info, if he have friends everywhere around who tip him with some info all the time.