TIDA-010210: The purpose of the delay

Dear Sir/Madam,

I saw that there are 6 relays of G4A-1A-PE DC12, i.e., K1, ... K6. My questions are:

1. Are these relays really necessary because the GaN switches does not have a body diode (No passive rectification)?
2. Can we only use 3 relays if they are really needed?

Thanks a lot.