About it being bad manners to bring up Saotome Sensei's Training History in public?
Do you say this because you don't think anyone is or would be offended by this thread? Or do you not believe it is bad manners to offend people? Or something else?
I don't believe it is bad manners to point out a factual discrepancy in public statements made by Saotome and ASU about his training history. The discrepancy is real. I have made no aspersions regarding the sensei's character or skill in aikido. Neither has Chris Li. If some people are offended by having that discrepancy pointed out, then that's unfortunate. But blaming the messenger will not make the discrepancy vanish.
In the end, it's a minor thing. And Saotome sensei has prestige and "face" to spare. So perhaps it is best to move on.