If Ainge is really considering a Rondo trade, it is not for the highest pick possible, it is for a certain player he wants. I think if he´s sure that this guy will drop to, say, #5, he doesn´t care if he gets the #2 or #4.
I love Rondo (and hyping him up) as much as the next guy, but if Ainge thinks he can get a player of equal or higher value + another prospect he likes, then it would be foolish not to think about it, imo.
Spencer Hawes, for example. I don´t know why, but I simply don´t like him as a person, but you have to admit that he´s a highly talented, young player on a position that is hard to fill.
How many high Draft Picks were busts? Look at the superstars that picks from 5-15 produced over the years. This may be a weak Draft, but that doesn´t mean there´s not a diamond in the rough. The experts were too often wrong for my taste to trust them when it comes to Rookies.
If Ainge knows something we don´t know about a player in this year´s draft (and I bet that´s the case here), I trust him to make the right decision.