In this case, what's left to discuss about Mustang? At this point - only old data that might be not reliable at present. And even if it were, the previous 10-Q of MSTG is rather discouraging. Especially, when looking at the negative stockholders' deficit, the increasing accumulated deficit and the higher amount of liabilities.
All the above-mentioned facts can easily explain the going concern consideration for Mustang and its future operation.