^Marco was never "the Trek editor." He was one
of the editors who handled Trek. When he first came aboard and for several years thereafter, John Ordover remained the senior editor, with Marco working alongside him, Margaret Clark, Ed Schlesinger, and freelancers Dean Wesley Smith on the Strange New Worlds
anthologies and Keith DeCandido on the SCE e-books. When Ordover left, Marco was promoted to senior editor, but he was still working alongside all the others.
Studios' preference for more limited novelizations, faithful to the source and adding little or nothing, has been an industry-wide trend in recent years. It's not specific to Trek or to Pocket.