In Tobirama Senju's words, they were dead, and whatever happened to the living had nothing to do with them.
As for Orochimaru, he was an exception born of insufficient technical capability.
You could say Tobirama Senju had double standards. After all, that was the reality.
It was just that he had reasons he had to do so. For the truth they longed to know, Tobirama Senju did not mind being flexible with his bottom line.
As for just how flexible that bottom line was, you would have to ask Tobirama Senju himself.
"The stability of both streams of Ryūmyaku power has reached the expected level. We can begin the collision experiment at any time. But, Lord Second, are you certain you can anchor the point in space-time?
"I'm not belittling your abilities, Lord Second. It's just that space-time and space-time travel... are two different concepts. You understand that, don't you, Lord Second?"
Nearby, Orochimaru stood in a white lab coat, holding his notes, his head lowered as he wrote something and spoke in a raspy voice.
When he said the word "concepts," Orochimaru stopped writing and looked up at Tobirama Senju with a smile.
During his time working with Tobirama Senju, Orochimaru had come to fully recognize one thing: his own talent in science and technology truly far surpassed Tobirama Senju's.
So... the probability that the path he envisioned could work had increased.
"To be honest, I'm not very confident. However, I've already prepared for the worst. If something goes wrong with the point in space-time we travel to, then... we'll just have to wait. You've probably already figured it out, haven't you? The current state of Izuna's body and mine."
At those words, Tobirama Senju turned to look at Orochimaru, a trace of complex emotion flashing in his eyes.