Not really. To get that crit Vader needs to spend an action on a target lock so he won´t have either the focus or the evade that the Defender has.
Yes really, that build is based on taking TL once and never spend it. Leaves Focus/Evade/BR or Boost still on the table. The dial is the bigger issue, or the absence of a native boost action on the TIE/AD x1. No native boost means no thrusters and it means as well that you usually can not have the MK2 on Vader to pimp the dial into something more useful,
With Kylo Ren crew I am still sure that we see Vader again, He really is the easiest way to apply crits right from the start and make the best out of "Show you the darkside."