People get very upset over the definition of what is and isn't an "ace." On here, people will always use that word to denote Roger, Pedro, Sale and peak Beckett. It may not be a fair term to put on every pitcher that is put in the #1 spot.
I don't think Flaherty should be the #1 guy in the rotation. Houck shouldn't either. I think they need someone else to be the #1 guy to lead the staff.