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Clearly with the loss of SRB thrust the stack would have been in a ballistic arc. I wonder if ET sep could have been accomplished as the Stack reached the top of that arc? Velocity would have been low and conditions would have been similar to the nominal RTLS post MECO coast, with the exception of the fuel load not being at 2%.

I did some thrust to weight ratios over time using the known data:

This data tells me that on 51L with no SRB attached after 72 seconds the thrust to weight ratio would result in the vehicle losing velocity. However, after MET 124, the thrust to weight ratio between 51L with a leak and a nominal flight would be similar. I provide 3 examples of the numbers used for a nominal calculation at the bottom of this spreadsheet.