Quoting MummyTummy:“ You are assuming that I let her scream until she's exhausted. I don't. Phoebe started self-soothing ... [snip!] ... herself. I wouldn't let her cry herself to the point of exhaustion. But then, I don't consider what I do with her "CIO".”
I don't think that fussing is quite the same as CIO. I don't do it because it would never work with my LO without an emotional meltdown first. Sometimes when she is almost asleep I lay her in her crib and stand there with her, pat her back/belly or whatever until she closes her eyes, but she never fusses or cries.
But yeah I definitely don't consider a couple minutes of fussing before falling asleep CIO, it's just not anything that I do.