I think Stone did, but the rest (or at least, most of it) was session musicians brought in by Tate/Slater.
Is this stated on the liner notes? I only have a digital copy.
Of course not. The Taters would have loved for everyone (including the rest of the band) to believe that OMII, AS and DtC were fully QR albums just as everything up thru Tribe was (in terms of writing and performance). But while the rest of the guys in the band may have recorded their parts for these albums, to varying degrees, the Taters and Slater brought in other musicians (for whatever reason) that re-recorded the bulk of the music. A lot of this was brought out in the statements made by the band members when they were going to court after firing Tater and his wife.
Honestly, I think AS is probably the album that has the most of the band, or at least Michael Wilton on it. For OMII and DtC, he has very little presence.
Regarding those albums, I would also have to say that AS is probably the most honest of the post-Tribe albums that they did too. There's some good material on it, altho it could've been better. One thing a friend of mine said was that there's almost no variation in the tempo from song to song, and I tend to agree.