I'm confused. What in "Man of Iron" is trying to fit things together? It's largely a standalone story likewise stands on its own... which is a large part of why it doesn't fit where "Robot War" claims it takes place (among other problems it has taking place at that point).
Moving it to after "Prime Time!" allows it to exist at a much more inoffensive, non-intrusive point in the story where its events can happen without interfering with the comics' main narrative, which it most certainly does interfere with in its "Robot War" placement. "Prime Time!" is the conclusion of the Shockwave arc, while "Rock and Roll Out!" marks the beginning of the next arc, with "Shooting Star!" creating a lull in activity between the two, as there's a long time-gap of multiple weeks during that story and Megatron is the only Transformer character to feature in it. The present-day events of "Man of Iron" take place across only three days, allowing it to easily slot in during the time of "Shooting Star!" as a side adventure a few Autobots, the Seekers, and the Condors had while Megatron was stuck in gun mode with Joey Slick.