it would make sense, in a way. okay at the beginning, he was "hired" by cBob. over the years, note, years, of creating FET, they had grown a pretty close partnership, daresay friendship, and when cBob isn't going to come back, i think it just doesn't feel the same for Marty. now he's trying to finish, that is one thing; but i'm sure he's greatly missing cBob's distinctive way of telling this story. that, and all on his own, the workload -per scene- is doubled while he's pushing himself to deliver something in a foreseeable timeframe. there have been discussions a time back, that he should hire a coder, or writer, but with this grown partnership.. wouldn't have been the same. i as well think he's trying to wrap it all up and put and end to it.
there have been numerous teams, with more people than just two, sometimes alot more, who have never been able to finish one game.