Yugioh Question on XX-Saber Gottoms and XX-Saber Faultroll?

ok so i need help on these rulings u have 2 x-saber monsters on the field u special summon faultroll from your hand or graveyard u synchro out for gottoms b/c one of the monsters was a airbellum u bring out gottoms and then special summon faultroll and then sacrifice it with gottoms ability to discard a card randomly from your opponets hand then bring back faultroll from its ability then just keep doing that is that possible and also is faultroll's ability or others such as saber slash has to be an x saber monster or can it be an xx saber monster why or why not thank