So it depends IMO on whether you want to outlaw that type of challenge that Bolton and Sterling both did. For me Sterling's is a stonewall red as he is out of control and flying in at speed, caught the player on toes but it could have been way worse, so definite red. For Bolton if the instruction is to outlaw that type of challenge then yes a red, otherwise i would say yellow.
I would say that the instruction from the top is to outlaw that type of challenge. Bolton needs his backside kicked btw.
I thought Don Robertson was 100% correct to stick with his on field decision and overrule Greg Aitken (surprised Robertson was even asked although with Greg Aitken maybe not !).
I agree with you on McLean only sticking with his decision based on what Robertson did previous night.