[Rules] (Rules) Section of Assault

[Andreas]

12.51 Leaders says:

Only leaders in an assault hex may influence units there. Leaders in adjacent hexes may not. Leaders in the assault hex may direct units in adjacent hexes to enter the assault hex, but may not influence them in any other way if they don't enter the assault hex.


I've found some previous clarifications here and there but for the sake of further clarity, is the following true:

1. A leader outside an assault hex in an ajacent hex can't assist units in the assault hex in their morale checks.
   
2. A leader outside an assault hex in an ajacent hex can't activate units in the assault hex for recovery and help them with morale increase.
   
3. A leader outside an assault hex in an ajacent hex can't activate units in the assault hex at all.
   
4. But (surely?) a leader outside an assault hex in an ajacent hex can activate a subordinate leader in the assault hex who then can activate units in the assault hex.
   

Many thanks in advance!