So, a question for the masses. I finally got myself together to get my own set of purple sharks, while I already got a set of Great Grey I'm now sitting and looking at the rules and thinking of what they could be used for?
I do notice the PS is worse than the great grey, it got less RC, less AC, less hight band range, same WD, and it is 3 points cheaper than a GG. With one exception, I got to buy a crew member along for 21-37 points extra. Also they can't team up but are only deployed in teams of 1.
So I'm looking at the three options: Gunner, Comm and Commander and I'm not sure what to chose.
Gunner: makes the RC same as the GG(!) and in essence makes the PS a 3/3 vehicle. That is nice and cost me the least, 83 points in total.
Comm: got marker grenades, forward observer ability. Thing is, the rules state he can't use his personal weapon while riding the PS. Do I have to disembark with him to make him able to throw that grenade?

Also is it even possible to use the forward observer ability? Will the PS stand still in mid air if doing so? It's a multi-crew vehicle after all so he must spend actions with the driver, but do that mean the driver only get 1 action he can do something on and I must use the forward observer ability on the first action? it takes 3 actions after all to use.
Commander: The commander acts as if he got a commanders helmet. This is nice. He must use this ability when within 20 inches of a unit though, 10 without a penalty so he must more or less be above them to avoid any larger penalties. Beyond that he do nothing unfortunately on the PS.
I'm obviously leaning towards the Gunner buyout, but what do others use these options for? And is someone able to explain the comm question?