No club will give up a top 15 pick for a 30 year old who is not a dominant player or kpp.
Getting Luke Ball probably made the difference between you guys winning a premiership or not the following year and if a team like Essendon believe that a Dal Santo could make the difference between them winning a premiership or not in the next 3 seasons, then I wouldn't think giving up a a pick like 15 to get him would be out of the question. After getting Goddard and Daniher so cheaply last year they may also feel like they can afford to "gamble" a bit more with their first pick this year, with winning a premiership in the next couple of years being what they want to win out of the gamble.
Dal Santo might not be held in all that high a regard on here, but the fact that pretty much every club in the league still puts a hard tag on him every week suggests that they think differently of him and how damaging he is when he gets the ball. Even you guys, who pretty much never tag, went to the trouble of putting a hard tag on him the other week.

