The Thermal relief consideration for TVS diode (for ESD protection)
You don't need to but it makes soldering easier.

Inductance is what matters more for ESD than resistance so the dimensions aren't too big a concern.


  
    My last question is if the other pad of the TVS diode, which connects with the ESD source can be soldered easily(also shown in the pciture), do I still need to care about the GND pad?
  


Huh?