Holy Shit, look at the title of this chapter. It's called Yamcha's Premonition and he called it.
If Krillin had gone first, he would've died to the Saibaman's surprise attack instead. Krillin can't be revived anymore.
Krillin is the one who suggests the trip to find Namek's dragon balls and his death is what awakens Super Saiyan in Goku.
This one gesture had so many ramifications.