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The only problem with using one supply with multipal outputs is you would need to make sure all the output leads are the same length to minimize delay from wire inductance.
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The DC/DC supply only outputs 4 separate isolated DC outputs. Bypassing is local to the gate drivers. Delay is irrelevant.
A better idea for signal isolation is to use two processors, one on the low voltage side and the other on the high voltage side. Then only one signal isolation zone is needed to isolate serial communications. (As opposed to having to isolate gate drive, current and voltage sensing, and fault protection signals.) Maybe use a relatively powerful processor for motor control and high voltage side sensing and a simpler processor for I/O multiplexing/demultiplexing and low voltage side sensing. An additional benefit is that isolation delays are not introduced in the PWM loop.