No, Miller is not that much better than west at all. Thing is Miller is a former 6th man of the year. He is a 6'8 sg/sf who would come in and play the wally role. Except he shoots, defends and passes alot better than Wally. He would be a sharp shooter off the bench that can be used to give west and Lebron a blow and be used very effectively in small ball. He would be a huge upgrade to our bench and the over all team. In the playoffs you need an 8 or 9 man rotation. Our 3 starters, Boobie, Miller and AV, maybe even Hickson in situational circumstances. Miller makes alot of sense, but not as a starter.
Cardinal on the other hand, could even be bought out. He would be almost absolutely useless. He wouldnt even be able to get minutes from Jackson or Wright for that matter.
Oh and Miller could guard pierce or kobe for small stretches. We will have Mo guard rondo, wallace couldnt do that either. And we proved the other night, we do have someone to guard pierce already. His name is Lebron. I am sure you aree familure with his body of work.