So honestly ur the one who didnt bother thinking about this, Zekken will flex sova on sova maps exactly like he did for most of his t1 career (XSET had zekken on sova and cryo on jett now it will be n4rrate on jett and zekken on sova) for the breach part sacy litterally never played breach for SEN, Zellsis played breach for sen, now the only real question u can ask is what are they gonna play on split ? and the answer to that is that's a good ass question you can be genuinely worried about their split but at the same time its only one agent on one map, n4rrate never was an initiator he was a flex, but most of his flexes roles were initiator, see what im getting at ? it will litterally be easy asf for him to adapt since they're making him play ONE new agent not multiple
(thank you for coming to my ted talk)