Couldn't Wanny have purged those players as well? If he believed he could win with the players that constituted our defense last year would that fall on him or is that only on the shoulders of the people above him? I always assumed that he had a say in the personal we fielded on D last year (as in pursuing FA's and cutting players, Mario for example).
Having asked that question, I think it was a bit of both.
Also, if players saw that others weren't playing to their ability due to lack of effort couldn't he see that too? I don't recall any players getting benched for those type of things but I may just not be recalling it or it may have not been that obvious at the time.
And, if Pettine does succeed this year could a case be made that the talent was misused more than anything else? Assuming no major additions are keys to success this year.