^^^Something about the phrasing gave me the impression that his betaverse coworkers were dead. If he knew they went to gammaverse would he be so sure it was impossible they were alive?
And is betaverse not our universe?
The way I saw it was that the old guy and his friends were researchers on the original project, and his friends successfully escaped to gamma while he was captured. He was tortured (lost an eye) and came to believe that his friends were killed.