Istredd would probably agree he doesn't think it's the center of all universes. He wouldn't be surprised if it's connected to them though, in some way. If it's capable of sending the Summoned back, it must be able to do something that knocks them into their universe. It's all speculation. Istredd would just prefer to assume the Singularity is important enough to protect.

"I can share my research with you. It isn't much but it is the best we have right now." That includes everything he's read in the history or been told here written down. Istredd didn't write down his experience going to the Singularity though because that is ultimately still a secret. Not that he would note all that much different, only Rhy could truly tell details. The rest of them were suffering at the time.

"I spend time at the Singularity regularly in the Horizon too. I haven't noticed any awareness myself, but there are people it responds to differently." Rhy and that other woman that Jack outed, who he met once and she seemed very confident about her opinion of the Singularity.