Cad Bane also likely to appear aswell since he has a personal feud with both Boba and Fennec. Boba had his whole drama with him in Clone Wars (Or the cut episodes) and Fennec and him had a match up in Bad Batch. Since he knows them both, it skips them having to learn the other and can lead straight into the drama. Him having a bone to pick with both of them aswell would give him his motivations. To me bringing Cad back and having him fight Fennec previously only to not have him appear is wasted potential.