With GSP out of 67, hopefully we will see serra drop down to 155 instead. Replacing rush with Sherk will still give us a great card.
Otherwise... when will sherk fight again? After the next season of TUF??
Serra could be in contention at 155 but not 170. Sherk is a better match up for him. It's all around better to see Serra vs. Sherk at 155 in UFC 67!