I truly don't know.
After 4 UFC fights I'm knot at the nuthugger stage of claiming Brock as the best ever, butt his wins were very impressive.
He mismatched all of his opponents with size and power. If he beat Fedor and some bigger fighters, e.g., Gonzaga, and perhaps Arloskwki (sp?), then I'll join the nuthugger crew
However, to think Brock couldn't compete with Fedor, or any other HW on the planet is distorted.