No, you don't. He helps ARC's out, but he is by no means necessary. Not even against torpedo boats - it takes a minimum of three torpedoes (barring damage-increasing crits) to kill an ARC, and that's assuming the maximum four hits every time, which in light of the change to R4, is less likely than it used to be (and Overclocked R4, the new droid of choice, reduces their flexibility in subsequent turns, making it harder to chain into the second salvo) That's not accounting for any regeneration or successful evades that occur.
It also doesn't account for killing a Jumpmaster before it has fired any/all of its torpedoes, getting into the blind spot at R1 and denying their use, dealing sufficient stress to lock down their ability to fire them (easy enough for R3-A2 ARC's), or for the fact that every single ARC except Braylen shoots before the Scouts do (and he ties with them).
Realistically, the only way you are losing an ARC in a single turn is if all three of the Jumpmasters have arc, range and a Focus, and if that's happened, you've flown poorly.
Personally, I fly Wedge instead of Biggs, alongside Thane and Braylen. Whichever target my opponent chooses, the other two make them pay for it.
Edited by MalusCalibur