I think you've nailed it. Don't get me wrong because I have great respect for Moss and his ability. I am also concerned about team chemistry because I remember the days when they talked about the "dream backfield" with Dorsett and Walker that never seemed to pan out. If they could sit down with Owens, Moss, and Romo and really get everybody on the same page I might be willing to take a chance. I just wonder how much TO will still love his QB if more TDs go to the other 81.
But in the bigger scheme of things, even if they could get Moss to "join the family" with no sibling rivalries, I am still very concerned about our secondary. I think there is a bigger need there than in our offense. The New England game was winnable if we could have gotten their offense off the field. We lost the playoff game against the Giants when they figured out that all they had to do was throw to wherever Reeves was covering.
I'd love to have Moss here if it doesn't upset team chemistry, but our biggest need is defensive secondary IMHO.