I think Olimar can actually grab dtilt if he buffers it, but in practice, this is still a usable pressure tool, and excellent when you can confirm it, or punish a landing.
I was rather careful to say an non-perfect Fair, because Kel is asking for advice in a MU, so telling him information that would require him to perfectly execute every aerial is unrealistic, and will provided an example of a non-perfect Fair. I thought a perfect Fair was -4, not -3, but I might be thinking of Uair. Either way, same ****, lol.
I was under the impression that the frame data for the falling aerials included the landing lag. In practice, this has been so.