There are 3 options for the Tie Striker Gunner Slot for a Hyperspace.
Strikers don't not have turrets, correct? If so, then why are 1 and 2 an option?
Will viable options be available in the future other than Skilled Bombardier?
Agile and Hotshot show as options in the Squad Builder due to them not requiring a mobile arc to equip.
When he (eventually) gets added to Hyperspace, Fifth Brother can be placed in the slot. That's pretty much it at the moment, as there are very few gunners which aren't tied to a mobile arc.
It's weird that agile and hotshot don't have turret requirements like vet turret gunner does
Not sure what fringe case they're trying to avoid where a ship that can't take vtg could still benefit from agile/hotshot
It's more a case that none of them need the rotate prerequisite.
I suspect it's been added to Veteran Turret Gunner specifically to avoid cheap double-tapping TIE/sf (since it's the only ship with a 'turret' and a gunner slot not to have direct access to rotate)
That is more of a glitch of the slot system than the app. The app is only there to make sure it is legal as in compliance with the slot system, it is not there to make sure the combination is effective.
The problem was there even in 1st edition, you could technically put Engine Upgrade on a TIE Interceptor and add 4 points to it but it would have no positive effect for your list.