Ship ability mat mk III system is broken

There has to be a change to the current system, as Ship mats MK3 are locked behind dark side ships to be collected and their characters maxed out. I didn't want dark side ships, and never cared about geonosian toons, so why am I forced to spent loads of resources and time to get 5 dark side toons I never use, to do T3 Executrix challenge, only so that I can unlock the mats for my light side ships ? I can't upgrade Light side without dark side, it just doesn't make any sense. The mk3 should be available in all levels, just at lower rate or whatever, but not locked out completely.
Or allow the Challenge to be completed with other leaders than just executrix at 5 stars. The only other option at the moment I have is to pay for ship shards to get executrix up to 5 stars, so that I can do the challenge.