Hah. I was going to post about my shadow game, but since yours is pretty damn similar there's no point.
I too stole Zara's initial worker. And I also put a warrior on that wooded hill. (I never chopped that forest; it held sentimental and historical value to me

) Later I put a pair of archers on that mountain range. This kept him from expanding although later he did breakout of the blockade by taking a barbarian city and, just as importantly, it kept his workers inside the city. He didn't improve anything. That gave me a massive turn advantage over him. Of course it didn't do anything to slow down the Americans who ruthlessly stomped Khmer. I joined the war against Khmer but never sent any troops. I was only there for moral support.
The big difference in our games? I didn't rush Zara. Or anyone. I figured I had dealt him a blow that would set him back. So I peacefully expanded until my massive, drafted rifleman army attacked Zara in 1495 AD. Yep, that was my first "real" war the entire game. I had joined a couple wars against Khmer; plus there was the great Worker-Kidnapping War. My first real combat, however, occured in 1495. Then it was constant warfare to the end.
I was actually like 1,200 points behind the Americans who reached the peak of their power in 1610 AD. (I invaded in 1600 AD) Then I did the oversees invasion of the Aztecs to push me over the top. Our games looked eerily similar (except the Dutch never sprung up in mine).
My score could have easily been higher if I attacked earlier. I waited because I wanted to "leverage" Saladin. What I did was use spiritual to swap to nationhood every 15 turns or so and draft a new riflemen army. My last 4 or 5 games have been with protective leaders and I'm coming to realize how powerful drill 4 can be. So, I drafted a rifleman army every 15 turns. I won around 1905 and ended up with a 70,000+ score. I'm content.
I must defend the ALCs though. It is the All
LEADER Challenge after all. The point is to learn how to use the different leaders and their traits more effectively. It gives players more experience with a myriad of situations that they can then put to use in their A-game. You gotta test your boundaries and see the extremes before you can incorporate that into your core game. For instance, I just recently learned to use specialists effectively after trying to run an exclusively SE economy. Plus, it's just fun to try out the new things instead of doing the optimal thing every time. Obsolete's wonderspam thing is a blast and it might be the easiest way to win.
So, when it comes to your DFA economy, I think of college. Sure, I coulda had better grades if I didn't **** around, but ****ing around is so much fun!