Phrase "we came back to believing"

[Clunker]

From http://www.nytimes.com/2009/07/05/business/05corner.html?pagewanted=3&8dpc&_r=1
There was so much good momentum and we were asking all sorts of good questions and launching new, good ideas. But ultimately, they took away resources and energy from the fundamental core of what we do, which we came back to believing was the most powerful thing. The obsession with truly staying focused on our core mission, I think, came from that.

Does we came back to believing equate to we believe? Is it a comment clause and thus parenthetical?

Thanks

[Mister Micawber]

It seems to mean that they believed, and then they did not believe, and then they believed again. I don't see it as parenthetical to the text.
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Native English teacher at Mister Micawber's

[Clunker]

Thank you.

[Emir]

[Mister Micawber]

Yes, Emir, the phrase is part and parcel of the utterance, to my mind. It defines how they approached their core activity. Grammatically, of course, you can remove the part you are talking about, but then the text says less.
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Native English teacher at Mister Micawber's