I'll have to check this out later when not at work.
I go warm and cold with Keith's early work, which is definitely derivative of Bley. But it's not bad and some of it is quite enjoyable. That said (and not to go into too much Jarrett-bashing), I find a lot of his work from the later 1970s and subsequently pretty grating.
As for jazz and not-jazz, well, YMMV.
I think some of the arguments against early Jarrett, Carla Bley's classic run for Watt, etc., as being "romantic improvisation" and not out of the "jazz tradition" are a little oversimplified. Categories and the words that delimit them are worth having as signposts, but the signs they hold are often merely suggestions and not gospel.