"I know my opinion might not mean much, but I think he will be?" she says softly. "I mean, I never met you, but there's always a chance that another Sam could go back, from another point in time. I've been back and forth before -- I don't remember the first time, but there are people there who remembered me. Plus, it's not like Sam was the only Sam there. There were two of him."

Not that Buffy knows any of the details regarding the second Sam, ie. he's a demon, that his Dean fails at making friends, or that lots of badness happens when that Sam's switch gets flipped. But that's a problem for another day in her mind.

She also didn't think of the fact that there being more than one Sam? Could be a bad thing.