It's worth noting that you're probably going to see one, maybe two, Encrypted Allagan Tomestones each week, that's going to go to one out of eight people in your raid group, and once you even get it you need minimum 3 more weeks after 2.4 to farm up the Poetics to actually build the damn weapon.

Nexus is going to be the best weapon you can access for several weeks and up to even 2-3 months depending on how your group organizes and their success rate in Coil.