You just spent yesterday arguing (correctly) that the difference over a couple hundred ab's the between Parra and Bruce the rest of '15 was limited best... it's the same argument. Feldman in '13, might have been a better bet to produce during the remainder of the year vs. Arrieta.. but the innings were limited enough that you could argue either way.
Regardless, you could have found a way to keep Arrieta on the roster... and that would have made more sense big picture wise.
Ultimately, isn't this the reason to be sellers this year?
I mean, today's game(and the next 3) are really the season in many ways. If you lose today, the division is still attainable but not likely. Unless the Yankees have injury issues, I think they hold on to win this division. The pitching is good enough, the back end of the pen is unstoppable and the offense is going to keep producing.
So, its all about the WC and you have 6 or so teams that have a realistic shot at it and I don't think you can definitively say the Os are better than any of them, at least not with how this season is playing out.
The Orioles have been unlucky this year but the old say of I would rather be lucky than good can work in the opposite way too.
2012 was a lucky season...the baseball gods are paying us back this year.
So, looking at the big picture is probably the smartest thing to do...but the next 4 games tells us everything.