Well, the purpose of this whole thread is to speculate about the relationships within the BRF - based on available information.
It can't be anything else as few, if any, of us are privy to first hand info.
So going along these lines of speculation: If there is no discord, for a lack of a better word, between William and Harry, and Harry didn't mean to even hint that possibility, where is the clarification? Either from the court or Harry or even William themselves.
Clarifications are issued all the time by pretty much everybody else, so why not in this case? Before speculations in the pres take over. Especially as the Suffolks in particular have a somewhat - strained - relationship to the press these days and not least because their public image (also in other countries) have begun to show cracks.
Following the course of logic: Harry did not categorically deny there is a strain of some sort between him and William. Ergo, even to an unbiased observer, the idea that there is a rift, will move from unlikely to a plausible possibility.
And as long as that thought is hanging out there, unopposed by the BRF, this thread will remain very active!
Harry has brought William in an impossible situation:
If William says: No problems. - It can and will be seen as firefighting, as long as Harry doesn't say something similar.
If William says nothing, the speculations will continue.
If William say something that is equally open to interpretation as Harry's statement, the press will run amok! And so will this thread!
It basically takes something like Harry and William singing a duet in front of Buckingham Palace to rectify this mess!
Okay, let's for the sake of argument say there is a row between the brothers. I'm sure each of us can easily list five or six possible reasons for that, before pausing for breath.
But why oh why, would Harry open his mouth and even hint that there could be such a row?
To me the most obvious answer (and yes, it's pure speculation) is loyalty. Both brothers have families now and that's where their first loyalty lies.
Harry is under pressure. He feels under pressure I'm sure! And even worse he must feel pretty powerless as well.
In such a situation you tend to see things in black and white. Even the most experienced person can end up in that situation, where things become black and white. And in that state of mind people often tend to say: If you don't see my point of view, you are against me!
Even if those trying to advise you, only have your best interests in mind. After all you tend to lash out at those nearest and dearest to you, when you hurt inside. They are the easiest ones to hit...
It takes two sides to make a war and when war happens, there is collateral damage on both sides. 
