I thought about this, and in the last surgeons defense, these are my thoughts: although orthopaedic surgery is not my speciality, during my surgical training, I did spend enough time working with orthopaedic surgeons to have still retained a fundamental understanding of the issues involved. Perfect alignment or an anatomical fixation is possible only if the bone fragments allow this. I can just imagine the surgeons during that final operation having to trim down the infected ends of the unhealed humerus, interposing a bone graft in the gap created and plating the humerus again to achieve fixation while maintaining length and optimising rotation. They can only plate what they are able to plate to in order to achieve fixation that will not fall apart. At the time of that last procedure, they likely had to compromise and plating with some degree of rotation was one of them. The huge success is that they managed to achieve healing. Humeral length is a common compromise since upper limb length discrepancy isn't as detrimental as a lower limb length discrepancy. Allowing for a little rotation is another compromise. Unfortunately for top tier athletes, there is very little room for compromise. The need for a 4th operation, 'IF POSSIBLE' and 'IF REQUESTED' was likely already known about. If Marq had retired he would likely not have needed this 4th operation since he would be able to carry out the daily activities of mere mortals as ourselves without difficulty.
A LONG time was needed to be allow healing of his previous injury to FULLY occur and for there to be reliable evidence that there is no residual infection. Full healing will allow for breaking, realigning and plating the humerus to correct fixation while not causing unwanted injury that could either lead again to non-union or nerve injury. I was wishing his radial nerve well while thinking about him and his operation. Looks like it came out the other side OK.
I think he will be physically fine, but I'm afraid that this has all taken a toll on him and he isn't that young and dare I say, that hungry anymore. I doubt that he will be willing to take the risks he used to take that allowed for his many feats to achieve the success that he did before all of this started.