Lookleft, B777 and A330 pilots cannot displace 737 crew. That is explicitly stated in the relevant EBAs. The only question is, if 737 crew are made redundant as well, in what order are the crew reemployed. The EBAs state that a redundant pilot maintains their seniority for 5 years from the date of redundancy, so in that scenario a WB pilot could be rehired on to the 737 ahead of a redundant 737 pilot. But that’s for the Unions to negotiate with the Company I guess.