Agreed, it was Shanny that claimed the Core 4 were being run back ,well before he hired Treliving.
BT took the GM job knowing his boss already set that table for him. Perhaps now that is has failed again, finally the President's 10 year "Shanaplan" can be set on fire and then buried 10 feet underground.
Getting rid on Keefe was a no brainer, he wouldn't even be in the NHL if his BFF hadn't brought him in from the Soo. BT most like kept Keefe for exactly this reason fully knowing the core 4 would fail and then he needed a front line scapegoat to remove by playing the fire the coach move, before now he can try and fix a flawed President's plan.
If we thought Leafs soft core 4 didn't fit playing the Keefe style of hockey, then none of those 4 are going to like the big, heavy, physical hockey Leafs next coach is likely to deploy.