I wasn't there but if the accounts that say the FS made an earlier pass over the field are true, THAT shoots down your statement above. The RC guy should have landed IMMEDIATELY! end of story....If he had, he would still have his plane.
The full scale pilot was going to do a go around. That would mean maintaining at least500 feet above the airfield. Not a low speed low altitude smoke on pass. If you are a full scale pilot review airport proceedure in the AIM.