I do like to think Galbreath will make the hall of fame, but it really is a question of whether you value the highest peak of a players career, or the elite level of play for a longer career. I dont think he has ever lead the lead in sacks, like Brumm has several times, but he is always right towards the top and has a bunch of 10+ sack seasons. Originally we brought him in to Buffalo to take some pressure off Ortiz, but for a lot of years in the past he has actually outshone Ortiz.
I think the biggest arguments against are probably that his early career was pretty underwhelming, and he just has not played on any really contending teams to get the attention he would otherwise. He's definitely a very borderline case either way.