Based on the evidence provided, I'm not convinced that building 7 fell because of diesel generator fires and debris from the falling towers. So, let's just go with all the other details.
(note: I'm not saying that I CAN'T BE CONVINCED that diesel generator fires and debris are sufficient.)
Which other details, specifically? The tensile strengh of the steel when heated? The burning temperature of the fuel? Whatg sort of details would make it convincing for you?