Not op, but I believe he meant that casting in theater and cinema are different.
"In film and television, the audition is called a screen test, and it is filmed so that the casting director or director can see how the actor appears on screen."
> disqualifies Shakespearean theater in the time of Shakespeare
Ira Aldridge was born a couple centuries later than Shakespeare's King Lear.
Theater and movies are different media, if you wanna put up a play about Matrix you need actors that are able to act and to fight like in the movie, which I guess are not that many.
If you're shooting a movie, you simply hire stunt doubles.
Cinema is a fiction, it's not a live performance.
Most of the times main actors are there because they are popular and help the movie promotion.
Presumably also Ira Aldridge as King Lear.
What's especially funny about this is that your criteria disqualifies Shakespearean theater in the time of Shakespeare.