I'll take Clay as a good number 3 type starter. Hell, a full season of 4.25-ish ERA would be enough for this team to win the division if Beckett keeps pitching like he has and Lester can remember he's good. We don't need three aces to contend in the division. We need our pitchers to give the bats a chance to win. And with 5.25 runs per game (second best in the AL) that doesn't have to be ace level production from our top 3 pitchers. Hell, if our rotation averages quality starts we're going to win a ton of games, and quality starts aren't that good (4.50 ERA).
Anyone who thinks Beckett hasn't broken out of his early season slump just isn't paying attention, IMO. Four straight games of 7 or more IP and a 2.20 ERA over that span is the definition of ace level performance.
Clay is clearly headed in the right direction and has looked like a completely different pitcher in his last two outings.
Lester has enough of a history as an ace or near ace that you have to think he'll figure it out.
With Doubront pitching way better than expected and Bard managing to be decent for a 5th starter (soon to be replaced by Daisuke who will likely continue being decent for a 5th starter, the team just needs to keep doing what it's been doing over the last 20 games and they'll make a good run at winning the division. Never mind if they make a trade for another quality starter.