Ever since Leg Sweep was changed from a damage skill to a stun only move in Stormblood, low level (pre-30) DRG/LNC has been really boring before gaining Jump to weave in between combos. What I propose is that Piercing Talon, which is extremely useless at high levels (or any level, actually) gets changed to an oGCD. Instead of removing the skill entirely (because it's rarely used and takes up a slot, make it upgrade into GSK and Nastrond via traits while under the BotD/LotD effects).
Level 16-59, Piercing Talon is a ranged oGCD single-target attack with 160 potency and a 30 second cooldown. Upon reaching level 60 and gaining a trait called "Enhanced Piercing Talon", Piercing Talon gets changed to Geirskogul while under the effect of Blood of the Dragon with all the same properties it currently has. Basically, what this means is, Piercing Talon becomes a pre-Geirskogul before a Dragoon learns Geirskogul. It's used as a simple ranged oGCD. At level 60, when under BotD, it gets upgraded into Geirskogul instead of being a separate and grayed-out button only useable under BotD.
This way, even if BotD is down/cannot be used, the button is still active as Piercing Talon. At the same time, it's an oGCD to weave for low level players and makes it a simple skill progression.
Piercing Talon
Delivers an attack with a potency of 160.
Blood of the Dragon: Changes to Geirskogul.
Recast: 30s
Range: 15y
Level 16 LNC
Geirskogul
Delivers an attack with a potency of 230 to all enemies in a straight line before you.
Can only be executed while under the effect of Blood of the Dragon.
Additional Effect: Changes Blood of the Dragon to Life of the Dragon
Dragon Gauge Cost: 3
Life of the Dragon: Changes to Nastrond
Recast: 30s
Range: 15y
Level 60 DRG
Nastrond
Delivers an attack with a potency of 330 to all enemies in a straight line before you.
Can only be executed while under the effect of Life of the Dragon.
Recast: 10s
Range: 15y
Level 70 DRG