Well Darklight gear is better than what you will get in AK, if you want you can just go straight to Darklight.
Primals is all about teamwork and skill, despite people crying about gear. Same can be said for AK as well.
Not really. If you're in full AF you really don't have business being in HM Garuda, and definitely not Titan. Especially if you're tank or dps, healer.... maybe if you really know the fight people will take you for Garuda, but Titan? Forget it, total liability.
You could probably be accepted into Garuda if you have the bracelet, earrings, and ring from the Darklight set, because in general, by the time you have enough tomes to have those three items, you'll have gotten an upgrade from AK, something you'll want to run for the ring at the very least.