Ok let me try to break this down for you. By the way, thanks for asking a respectful honest question on the forums. 1. What makes the Ghjallahorn so great is the Wolfpack rounds. They are an after effect of the initial explosion. Granted other rockets have after effects but what the ghorn has is [b]tracking clusters[/b]. The extra damage these cause to bosses is what make them so great. just to out in perspective, it takes 2 331 ghorn shots from lvl 32s on hardmode to take crota down. it takes 4 hunger of crota shots respectively. So a team that has 3-4 ghorns can conserve heavy ammo and not worry about extra coordination. That's why people love to see ghorns in their fire team. 2. Other target tracking like truth? Truth is great but it only has an initial blast, so ghorn is better for bosses because of total damage output. Truth has the most aggressive seeking rockets but that perk isn't really a game changer in crota fight. 3. Simply put, no. You can try primaries to take crota down but it will take too long, then he will start moving right or left before sword dissapears and that becomes very challenging. You want to get him down almost instantly when swordbearer is ready, heavy is the only way and ghorn is the most efficient way. 4. Methods did change from normal to hard because of 2 distinct facts. 1, no chalice so avoiding boomers is very important. 2, when boomers die a which spawns which creates an additional challenge. With that being said, my raid team now uses middle strategy with Titan bubble on left side(to distract boomers) and we never deal with boomers (only when shifting inside) and we never deal with which da. But we use middle strategy on normal just because it's the safest mode with least amount of threat to die. Hope this helps