2) You're absolutely better at writing with James' voice in mind that anyone who's ever done that. Highlighting everything awesome about it in 3-4 minutes, then repeating it during each song on the album while ample space is left for other important stuff is not an easy balance to achieve.
Re 2: That's very nice of you to say, but I think there are some very good and capable writers in DT When I'm writing a song, I absolutely *have* to be able to sing it. If I'm not feeling it and it's not working for me first, then it's more than likely not going to work for James either.
Good writers in DT - deffo! But there's something in these solo discs, where James' voice really shines through. Which is absolutely appropriate, since it's his solo disc, so the voice is (quite rightly!) more of a centrepiece, but I'm in awe of James' voice on a regular basis on these solo albums. I think he's great in Dream Theater, too, but not so routinely incredible - the voice is part of the ensemble, rather than a focal point.
I'd say that, in these albums, you can always tell James is a virtuoso. And I think that's something your band's better at showcasing than DT are - and, as lead songwriter, I reckon you have to take a lot of the credit for that.