SSR 5: "...British Fire Support Group CANNOT move unless they do not have LOS to an enemy unit". Is the "not" correct? If yes, could the rule be rewritten without a double negative?

Hidden Weapons question - I am not sure what "...replace the eliminated unit" with a FT/ Satchel Charge after a 1d6. An example and rationale are requested. Thanks.

Multiple Defending units receiving non-Opportunity or Opportunity Fire (5.2 addresses Multiple _Attacking_ units): Does each defending unit take a 1D6 Damage Check after the entire hex makes a single 1d6 opposed die roll with a positive Attacker minus Defender result?

(1) Is there a penalty for failure to place Smoke? (2) How are Movement Factors calculated for an Assault Moving unit with MF 4 that has successfully placed Smoke, with and without Double Time Movement? Thank you.

Can a non-To Hit SW can be "held back" for use in a subsequent impulse at a different hex if the possessing unit has been marked as Fired or Assault Fired?