TomaLexi: [current position] + R13Q14R7 It seems a bit harsh to consider the knights enclosure a "mistake" if its only 0.2 worse than the large knight, especially in a variation where black plays two -1.5 moves in a row as the explanation in the solution.
I would suggest making both count, one for efficiency, one for strength and less attack options.
John: In my opinion, the reasoning why R6 is better is clear and instructive. Also, AI rather strongly prefers R6 over R5. Finally, there is no reason for black to play the variation you mentioned since it losses points.
In my opinion, the reasoning why R6 is better is clear and instructive. Also, AI rather strongly prefers R6 over R5. Finally, there is no reason for black to play the variation you mentioned since it losses points.