Combat Recons do not show on D-scan, but Force Recons do. For quick reference Combat recons can not use covert ops cloaks.
When tethered yes, you can bump them out of tether but ias Hazen said it is not easy to do. The Gankers will have a safe spot close in and have one ship being the anchor and approaching it while the others orbit. Go and watch what they do in Uedama.
Hazen did the job on 1. & 2. Though for 1. DPS is too low to do anything more than get on a killmail unless you have a lot of friends. The video you linked in that other thread was a BS sniping, though his ship was not especially bonused for the guns, but was for the drones.
**Caldari Destroyer bonuses (per skill level):
5% bonus to kinetic Light Missile and Rocket damage
10% bonus to Light Missile and Rocket explosion velocity
50% bonus to Light Missile and Rocket max velocity **
Since the first few comments here have lots of trolling, here
1: Well, yes and no. The Sniper Corax as you’d know in eve echoes doesn’t really exist (the Jackdaw exists but its a separate ship altogether). The ship tech tree is very different between echoes and real eve. The Corax itself can also be a good sniping ship in itself.
2: I’ve never seen flashing blue before, that’s odd
3: Combat recons yes, force recons no but force recons can use cloaks which will hide them from dscan and your overview until they decloak
4: Yes but you can try to bump them off tether and then they can be attacked
Look here, at around 8 minutes. This where I saw it. The flashing blue skull would seem to be the icon for ‘limited engagement’. I dunno if this is because someone else is immediately claiming the kill right for the earlier kills…