Any number of answers to that one.
Course Oblivion has the alternate crew carrying the episode and the main crew finding their debris.
Pathfinder focuses on Barclay and Troi with the cast only getting that one scene in the end. Though there were some holographic versions that Barclay played with.
And if you want to get technical Living Witness had none of the main characters since it focused on backup modules and holographic recreations of said characters.