Absolutely. I know there are arguments for easier monitoring of health in pairs and many buns will only tolerate being in a pair. Having seen how desolate Floppy was when he lost Sonic and then how well he accepted Mittens and Starfish passing makes me try for a trio. Hopefully then onpy one is lost and can i can then bond another. But this is only my very personal thinking, not a proven theory.
With those two, their bond is so close i could imagine one being so heartbroken if the other goes that they would not manage to live without them. Bit like the old married couples where one is so heartbroken their heart just seems to give up.
*shivers* Hope its not an issue you need to face with them for a long time!