I don’t disagree with your reading and analysis, but I’m not drawing a straight line between Macbeth and Catesby.

I think it’s so interesting that there are multiple battles going on at the beginning of the play, and the line “What he hath lost, noble Macbeth hath gained” always makes me pause – because what Macbeth gains is the title of a traitorous thane, which Macbeth then becomes. The political unrest in my opinion is not with Macbeth, but with others around him. Also putting Macbeth into historical perspective (the reign of Macbeth, not Shakespeare) puts an interesting layer on the play. So there is the struggle for power of others in the opening of the play.

Also the struggle for power is not really with Macbeth either, it’s Lady Macbeth. When looking at both Shakespeare’s time and the historical Macbeth, again, there are interesting ideas to explore. Lady Macbeth is fighting under “her battlements” – which is such an interesting word for Lady Macbeth to use – her battle is within the castle, which she is confined to.

And then there is certainly political unrest when Macbeth becomes king, as evidence by Malcolm’s speech.

And Shakespeare certainly shows that Macbeth is not the rightful king, but there is also conspiracy to usurp him from his throne. One of the details I explain to my students is using the lens of the historical Macbeth, it would have been reasonable for Macbeth to think that he could reasonably become king as one of the greatest warriors, and Lady Macbeth’s references to a before-time seem to suggest that Macbeth’s ambitious may have not been so latent. But, that is one of the many ambiguities of the play.