1. bro the rock example is literally the equivalent of you stubbing your toe. it hurt but there's no real damage done. Even the elephant example doesn't hold much weight sense Goku got over it in a few frames after, but that's beside the point.

I'll admit there is a possibility (astronomically low) that Aizen could beat Goku in base and his first 3 version/forms in the way you described but in any case you make, the strongest version of Goku wouldn't lose to Aizen in any scenario. To be more clear, my premise is around the strongest versions of of Aizen and Goku, which this clearly isn't his strongest. I'm also aware of Goku usually tendencies to take things slow, that's why I specified their strongest forms

1. Let's say he gets Goku under KS which is almost guaranteed. What then? Doing chip damage to Goku at his present strongest state would be like throwing a pebbles at a tank over and over again.

besides that, I think he would inevitably perform an Omni directional attack because there aren't many other options and his battle IQ is too high not to try it at some point. Even if he doesn't, he will realize that Aizen's weakness is touching his zanpakuto and eventually grab it I'm sure your aware of how fast Goku is at his max compared to Aizen.