They were overpaid players who were not ready for the prime time leadership that the contracts paid them.
Thats why they became available. Eddy, Marbles, Craw and Zbo all individual talents but together was not a team. Craw's best role has been coming off the bench. Eddy's best role is the Jelly Role. Z-bo needs a real center to play off of. Marc Gasol makes Zach better, and visa versa. Jerome James and Eddy are not the best fit for Zach.
Isiah drafted well and special Nate in the right circumstances was bound to do well. He has yet to receive the long term contract because he is "touched" but his talent has never been a question.
Dlee has been a solid pro from day one. He is not a 5 which he was here.