>>2325375Yes, but every level counts, even for those characters. You just make sure that the offensive units actually get the kills.
In OG1 and 2 of course, anyone could have supply modules and this could become a nifty method of grinding if you have the patience.
>>2325373Of course, doing it on the appropriate missions is common sense. You don't slack around on time limit ones.
But still, I always find it more fun to make do with the money and EXP that you gain on a single run of each mission anyway.