Originally Posted by Turk Albert

You're on the right track, but sadly you got it wrong.

"one of the best money managers" is not a prepositional phrase, but a noun phrase. The whole phrase is the direct object of the sentence, becuase "one of the best money managers" refers to "Major-Hayte" Which is the noun of the sentence (the noun of the sentence is NOT one).

Since the noun phrase was plural, and the exclaimative (there are) was referring to that, the sentence was valid.

So...You were just proven incorrect once more. Come back again and make yourself look more stupid.