Pay no attention to that man behind the curtain.
Rumdoom's not death obsessed in that way. His branch of eschatology (which he developed himself) is focused on dishing out 'good endings' to those who will have a 'bad ending' if Rumdoom doesn't intervene. But he responds very positively to anyone who believes in something. Even if they happen to believe in something he disagrees with.And he's still alive.
She wasn't gestalting, but 'acting' Oscan. I just happen to think Oscan would be a little more subtle than that. These Ob officers have such interesting, fleshed-out personalities, but the opportunity to genuinely interact with them is minimal.If you hadn't said otherwise with your aside, I would've assumed that Gupta was specifically not gestalting with Oscan (because blurring your psyche with even a well-behaved sociopath has got to be unnerving to say the least), and just trying, on her own, to answer "What would literally the worst person do in this situation?" and perhaps somewhat overshooting the mark.
I should add that because of Xambria's past, she is 'trained' in gestalt. She can therefore help the others in gestalt attempts, which makes their mission a little bit less dangerous.