Response to gross-fog density with different developers

Different developing agents and formulations show a different threshold with the same film and exposure. Some developer formulae have more restrainer added to prevent fog, but this usually affects the film speed. I bet the effective speed, as measured by the exposure require to acheive 0.1D above B+F, isn't the same in all those developers, even if the gamma is made identical. It's likely that the Tmax developed film shows a higher EI than the others.
In any case, slight fog isn't a problem with B&W film. It simply lifts the overall density by a notch, and can be easily compensated in printing. It might even be beneficial in getting better tone separation in the shadows.

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