You should read the article I posted from In Lou We Trust. Those players are significant play drivers and can put the puck in the net AND play defense. Second tier guys? Yeah okay. Out of those three qualities, Ryder has one and he didn't even perform that role very well.
Vrbata doesn't really play defense. Tippett kind of accepts his limitations. Grabovski plays center and is redundant fit with Ruutu here. Ryder would have to be moved to make room for either Michalek or Vrbata.