I know Tony already hit on this but you seem to forget the fact that we have an MDP with MCXA, the communication on this has been open between all 3 parties for a good amount of time. TSO leaves MCXA with the acceptance, if not support of MCXA (they obviously don't want them to leave but understand the situation)
The key difference in these two very different scenarios is that TSO handled the situation diplomatically, keep in mind that the leaders of CEN had run for election less than 3 months before, and were going to be done with their terms less than 3 months after in addition to the fact that they failed to inform anyone before the left (except for those they recruited)
As to animosity for the leaders of the CEN movement, could you provide a specific or any evidence to back this statement?