Some years ago I read a piece claiming that statistically Don Bradman was the Greatest Greatest Of All Time.  The G-GOAT.  I think it was this one:
https://significancemagazine.com/did-don-bradman-s-cricketing-genius-make-him-a-statistical-outlier/
He compared Bradman's dominance with the level of dominance of some other notables like Jack Niklaus, Roger Federer, Dan Carter ...
Unfortunately he didn't include cycling so Merckx didn't get a look in.
Bradman came out well ahead, but I'm suspicious of the author's method. It involves finding a single representative stat (in the case of cricket - batting average, golf - major wins, rugby - points per game ) and seeing how far from the overall average for the sport each star was.  So it's massively dependent on your choice of stat.
There is also extra arbitrary skulduggery that he engaged in. He compares Bradman's average against the average of the population of batsmen who had scored over 2,000 (international) runs. He doesn't explain how he jiggled the stats for other sports.
He then figures out how many standard deviations the star's stat is from the mean of the stat for the chosen population. (Z score)
I'm not sure what stat you'd use for cycling.  Total wins of GTs and Monuments maybe. And what population would you compare with? Riders with at least one win maybe? Would you just count GTs as a single entity or broken into stages? I don't know. Meh.
Tl;Dr I read an article that I thought was a bit rubbish. It didn't mention cycling.
All in all a bit of a pointless post.
Edit: I think I've figured out a way to prove conclusively, using mathematics, that Cav was better than Bradman. It will take me a while though. ....