Why would such folks not count as participants who did not develop SOM and therefore lower the charted "proportion" line? Do you mean to say those patients did develop SOM but too late for the study? Not getting your argument.
IMO you really can’t reverse engineer the MC numbers and discern anything you can conclude on. It would be like determining how you shot a 72 on the golf course without seeing the hole by hole scores. Probably scared off a few potential investors though.