Choose the correct option
Michael Jordan is in a whole other class by ______

The correct answer is: Himself

Himself (the reflexive form of he) is used when the object of a verb or preposition refers to the same person as the subject of the verb, except in meaning. Himself is used to refer to a man, boy, or male animal.
'Michael Jordon is in a whole other class by himself', here himself refers to a man 'Michael Jordon'.