GI lead vs Third sister lead in ROTE Reva special mission

YouTube shows 99% of players use Grand Inquisitor lead in ROTE Reva special mission and not Reva, WHY?

Reva lead gives stun immunity, you don't want Jawas to stun GI or Seven sister, better RNG and opening play.

The only advantage with GI lead is 66% max health and protection if you have protection primary mods.

Please explain and thank you.