Former Everton media employee Harry Watkinson at TeamTalk (I know, but seriously) was the first person to report on Thierno Barry and KDH, and has been talking about Everton's interest in Grealish for months. He's been responding to people on Twitter that the Dibling deal isn't dead, and to one person he said this:
In my head canon, Everton will reveal Dibling at the Roma friendly and everyone who knows it's done is doing their best to keep it quiet. In the real world, I think they'll pull it off, but it'll take a bit longer.