Apart from my incoherent previous reply and confusing it with other single engine fighters.
yes it well be better for MUM-T to have a twin-seater variant.
And buying the current variants and benefiting from china's scale will allow buyers to buy a good number of aircrafts for a value that someway accessible -- Say 50 or 75. Later they can buy a complementry twin-seater varaint like 24 units or something.
The key thing to understand is that single seat aircraft will all be
capable of command/control of MUM-T at baseline.
What twin seater variants offer is
enhanced command/control of MUM-T by having a second human being in the cockpit.
When everything else is held equal, the number of humans in the aircraft is the rate limiting step for greater command/control capability.
The net MUM-T command/control capability of an air force will depend on the number and balance of single seat aircraft and twin seat aircraft, and the variety and capability of drones/loyal wingman/CCAs/UADFs that they operate.
A twin seater J-35A would be better at command/control than a single seat J-35A, when all else is held equal, by virtue of having a second human being in the aircraft yes.
However given they already have the twin seater J-20S, and given they have J-36 (which is a twin seater organically) and J-XDS (which is likely to have enhanced command/control capabilities similar to J-36 except with one pilot rather than two)... and of course they have the single seater J-20, J-20A, J-35A, and various 4.5th generation aircraft which are all capable of varying degrees of command/control of MUM-T.
So, it is really debatable whether they need a twin seater variant of J-35A that has enhanced command/control than the standard J-35A.... as they could simply build more J-20S, or more J-20A, or more J-35A, or a combination of them, or await J-36 and/or J-XDS.