It does screw up the flow of a discussion thread if the Accepted Answer is placed at the top as the answer can come from any part of the thread and causes confusion as well as unnecessary scrolling back to the top and down again to follow the content of conversation correctly.
Suggestion
Do NOT move the Accepted Answer to the top of the thread, highlight it as you do now but keep it in the same position and place a COPY of the accepted answer at the top of the thread with an indication that this is the accepted answer.
The flow of the thread is not disrupted for anyone wishing to read through it and the accepted answer is available at the top for anyone who is only interested in the answer to the question without reading the thread.
Just a thought.............