No Moss

So Randy Moss still has 4.3 speed in the 40.
And according to former players, he's a good teammate.
But Moss is 35 and hasn't played in a year. And in 2010, he looked a shell of himself.
Granted, this is a low risk move for the 49ers. It's just one year. It certainly can't hurt. And they need someone to spread the field.
 But are we getting our hopes up?
 Is this Braylon Edwards all over again?
 If Moss is such a great teammate, why did New England dump him? Why did Minnesota release him? Why didn't Tennessee bring him back?
 Will he be a good influence on an already moody Michael Crabtree?
 Would he have made the difference in last year's NFC title game?