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Bitcoin cash won't add segwit. But if they can find an alternative to segwit that fixes malbity issues they can't add lightning network. And at the current rate most of the bitcoin cash developers are looking for finding even bigger blocks. https://news.bitcoin.com/7-million-transactions-a-second-research-paper-declares-1tb-blocks-feasible/

Did you mean to suggest they can or "can't"? Either way, they shouldn't add it as it is designed currently, to overtake transactions from the main chain.

I don't think most developers are "looking" for bigger blocks. Some of them obviously are putting together papers in a counter propaganda attempt, but that's not all or even most of what is happening. =)