and WHAT was that line about Finch going through men like tissues John not being the first one he'd hired?

I've speculated that, and so have others - i.e., Finch tried other agents. I love the idea of possibly seeing them, maybe they come back and are a threat to Finch and Reese is really emotionally conflicted about their existence.

Except now they've done and rewritten Reese's entire character arc and motivation - it was all for love of Carter! - that none of it makes sense anymore.