Interesting. Now for the big question:
If the "quotes" referring to (read: hearsay, not actual quotes) MacArthur's alleged views is correct in that the Japanese were openly willing to discuss surrender...what was Truman's motive for (allegedly) not even consulting the chief general in the Pacific--and what was his motive for dropping the bombs?
As for Ike's lines...note the ellipses. It is quite possible we do not have the full story, from that site. (And by that, I mean: I have often seen websites take famous historical figures' words out of context, and making said figures seem to say the exact opposite of what they meant.)
I'll grant that more research into the origin of these quotes may be necessary, however, William Manchester was a very well respected historian with many legitimate historical texts under his belt and the biography of General MacArthur that he wrote is a a perfectly legitimate source. As for Ike's quotes, the placement of the ellipses at the beginning and the end of the first quote (excepting when he's talking about the Secretary of War's entrance) doesn't change the contexts of his reaction to dropping the bomb itself. The second quote, while possibly taken out of context, would still reenforce the first, it was the General's publicly known opinion.
However, I do agree that more research is always a good thing.