Because Manafort does know how to run and win a general...Besides Cory had not had a good relationship with Ivanka who is doing a lot of campaigning for her dad....My best guess, Cory couldn’t fit into the new structure.
Also to note is that Trump does very well when he has a reasonable (I don’t mean Clinton reasonable) amount of rest and contact with his family. When he is over schedules his rhetoric gets more rambling. Scheduling was part of Cory’s deal.
And finally, Herman Cain said he was chatting with Cory before introducing that awww shucks ducky candidate Donald Trump backstage. Herman said Cory told him he was exhausted....hadn’t ever been this tired.
SO take your pick and relax Donald is still in charge
“Because Manafort does know how to run and win a general”
What General has Manafort ever run and won?
I think Corey was exhausted and it was showing in his personality, not his fault of course, for a year Corey has not stopped and his family I am sure was also strained!!! Corey WILL be taken care of by Trump he rewards LOYALTY!!!! Corey probably feels as though the weight of the world has been lifted off his shoulders Trump had a VERY SMALL team and Corey did a GREAT JOB!!!!