Why pick Talon over Ekko now?
Similar styles except Ekko doesn't need a ton of plat pen, has longer range dash, poke/siege, aoe stun, shield, and an idiot proof re-do button that can also 1 shot squishies.
Very similar passives but Ekko can trigger the effect after 2 stacks with a spell or auto on the 3rd, but Talon can only apply stacks with spells and can only trigger the effect with a basic attack after the 3rd stack.
Basically seems like a lot more risk and work for less reward.
Inb4, Parkour is just not special, Ekko can pretty much do it with his E and without on-terrain cooldown.