In 2006, the Mets finished 97-65, winning the National League East by 12 games. It would be fair to say that is when the window was open at its widest for this core of Mets. And, we’re talking David Wright, Jose Reyes, Carlos Beltran and Carlos Delgado. While that core has remained largely productive, the rest of the team, in particular it’s pitching, has not.

The strength of the 2006 team was arguably its bullpen, which picked up the slack for a consistent, but hardly spectacular rotation.

Despite signing Billy Wagner, at the time an All-Star caliber closer, Omar Minaya let two significant keys to that pen, Darren Oliver and Chad Bradford, get away. The Mets have been struggling to get a bullpen chemistry since. An argument can be made the chemistry started to fizzle with the decline of Aaron Heilman, who was so good in 2006 save that pitch to Yadier Molina.

Even so, the team started strong in 2007, taking a 34-18 record into June. Would we all agree that 2006 and the first two months of 2007 was when the Mets’ star burned its brightest?

They finished 54-56 the rest of the way in 2007, including a collapse in which they blew a seven-game lead with 17 to play. Much of the downward spiral was traced to a bullpen bridge that could not get to Wagner.

Since June 1, 2007, the Mets are 20 games below .500 – including another collapse in 2008 – and the refrain was the same after each season: The pitching is the problem. The 2008 team, by the way, blew 29 save opportunities.

It’s a double-edged sword: The bullpen is overworked and ineffective. But, the reason it is overworked is because the Mets aren’t getting quality innings from their starters.

For those who think I’m being too negative, those are the numbers.

I realize 2009 was a unique season because of injuries, but even under the assumption the core offensive players return to form this season, there remains largely the same pitching staff. Never mind the team’s hot start one-third into the last season, more representative of their performance was the remaining two-thirds.

Getting Johan Santana was a significant gesture of improvement, but he makes 34 starts a year. The pennant is won or lost in the remaining 128 games, and this is where the Mets are weak and have not improved.

Even Santana is a partial question as he’s coming off surgery. The team says he’ll be ready, but said the same thing about John Maine. Maine’s durability, along with his presence, are questions. We don’t know what we’ll get from Oliver Perez inning to inning, much less game to game. And, Mike Pelfrey has regressed. And, well, there is no fifth starter, yet.

Yes, Jason Bay will improve the offense, but in reality aren’t we subbing his numbers for that of a healthy Delgado? And, there’s another hole with the loss of Beltran. So, just how much better is the offense, really? And, what if Wright doesn’t regain his power stroke? Can we say for sure Reyes is back?

Bottom line: We can’t say the core is back to normal or will get that way.

In that case, it falls again on the pitching, which is the same pitching that failed miserably the last two-and-a-half seasons.