I m not so sure about Crouch, but what makes you think benitez can operate Crespo better than Morientes. Morientes, to me, is very underrated.
Crespo.. wanted to settle down in a Team. ACM, somehow got hold of FREE (better than CHEAP) Vieri. They had tried negotiating with CFC for amost nothing price for Crespo and wanted Chelsea to pay 8m

for that kaladze!
In Crespo's position, what would you do. Go to the club, the top club who wants you the most. Mourinho's pulling power is there. While Crespo accepted Rotation and competition. It applys to the wingers, Gudjohnsen, Ferreira, Gallas, Carvalho... and of course, Cudicini. Crespo may be in that category.
Why would he want to venture out again? Its not like he is anyway younger.