I agree this wasn't really a shock, but I don't think this is truly a devastating result for TME. Parsons, Coleman, and Gusman were not in the "top 4" in their heats in terms of SBs, so failing to advance was the expected outcome for all 3.
For Coleman, he did well just to make the event and I'm sure he thought he had an outside shot at finishing 4th (or a time qualifier) in his heat if it went fast. Thus, he tactically tried to stay up front and hold on to the lead group. Tactically sound choice, but he just didn't have the fitness and blew up. Oh well, good experience.
For Parsons, he was in a tough heat with three fitter runners (Barega, Mechaal, Beamish) who he KNEW had better closing speed than him. The race went out very slowly which I'm sure made Parsons worry about qualification through a kicker's race. He probably decided to take over the pace to keep it honest, with the hopes that he could break the field down. It didn't work, but I'm not sure what else he could have done at his current level of fitness to qualify for the final. *shrugs*
Same thing for Gusman. His SBs put him in the mix for potential qualification from his heat and he tried to run a smart race near the front. Unfortunately he didn't have the legs for the necessary kick....but did you expect that from him? It seemed like his 7:44 this season was a time trial race where he held on for dear life, suggesting his fitness may be lacking towards the end of a championship style race.