1.) Greg is in TE2005, but his name is "Rusedski" !
He was not in TE2004 coz his ranking was not good enough, and there were only the TOP50 players in the 2004 version.
2.) Agassi started the year 2005 at a quite good ranking (8th rank)... After depending of your game, he might go down or stay up.
In pure strength, he's the 16th player of the 2005 database, but the top 20 players are very close of each others.
And in real life, Agassi is now at the 14th rank, so it's quite accurate.
Anyway, if you really don't like him, you have the possibility to edit the player banks, and give him bad characteristics...