ooh maybe they became friends lucas' senior/junior year? up until then not much running into each other going on and then either because of some extracurricular thing, a school event, or a party they ended up hanging out and getting along and then keeping in touch after he was in college? LOOK he is just a fickle confused being however if joey is at least more open with himself now i think it would be great to throw that into the mix and lucas might one day be like tell me more sensei