Rare titans are often the ones where people pull out flasks to finish the beast at all costs. This might even put someone, who’s not used to it, at the front of the list of attackers, which is the worst loot tier. From the experience of my alliance, the best loot usually goes to people in the middle section and the top attackers rarely get something good.
Especially with rare titans, there’s usually someone who really needs the item, so they make sure the titan is dead. It is possible it puts them to the first place, which is almost guaranteed to not loot the item. Can’t we flip it?
Let’s leave the others with their looting chances, but make sure the one who made the most damage gets the item as well. It doesn’t make sense that the one who hurt the beast the most ends up leaving with 3 gems and a consolation coat.
Edit (a considerable time later):
I no longer think a guaranteed rare item is a good idea. Now I think the best way would be to only have three tiers, those who do exceptionally good damage, those who do exceptionally bad damage and everyone in between. The reward pool should be the same for everyone, the tier would only state how many times they get to pick from the pool.