The chrome spike going into the headlight must be a production/cost challenge. To do it right, the chrome spike would need to be on the outside of the headlamp glass (like the spoiler-to-brake lamps spikes on the rear of the new Porche Boxster), rather than than try to continue it under the glass as they have with the CX-5. The break introduced by having to continue it under the glass really diminishes the forcefulness of that line compared to the original design on the Minagi concept. Worse, the eye-spike line can only be be resolved at the center of the headlight/eyeball. If it doesn't get there, as happens on the CX-5, then it ends up being an unresolved line, further weakening the forcefulness of the grill-to-headlamp highlight.
From the videos for the new 6 (see video 1), it seems clear that rather than implementing an unconvincing literal interpretation of the "eye-spike" from the Takeri concept, they opted to keep the really forceful grill-to-headlamp highlight but instead point them to a spike above the headlamp. The line created by the top of the headlamp resolves the spike cleanly. Yeah, I'd have preferred the "eye-spike", but production design is always about compromises, and I think they did a better job interpreting the strong grill-to-headlamp highlight here than they did in the CX-5.