I think the O's have been let down from the offense more than the pitching this season.
However, I don't think we can rely on the current staff to replicate this season. I would probably prefer to go after one arm in trade, and one in FA, then supplement with guys currently on the roster. I don't think an "ace" is necessary, but would certainly be a "nice to have". Who knows, maybe Grayson becomes that guy?
I like the idea of having capable starters that keep you in games, then having an excellent bullpen. I think stockpiling guys in AA/AAA with one very good/excellent pitch and developing secondary pitches that are good is the way to go for relievers. That seems to be one thing that Elias and his staff have done well.