Wow is it just me or is it like 3 v.s. 1? Anyways, you get Lyn for the first 10 chapters but you get Guy like 2 or 3 chapters before you get Lyn back but she will still be winning in level. BUT Lyn can't promote until chapter 26 I think... not sure in HM but in EM Hector is probably promoting first. After you promote them both, Lyn gets bows but Guy is stuck with swords but she will probably be lower level then Guy since she promotes so late and no arenas. In the end, Lyn comes in earlier, promotes later but gets bows and Guy comes in later, promotes earlier and gets critical bonus. Take your pick because you might like bows more then critical but I like Guy better.