What is this guy smoking

I beat this guy using 4-5-1v against his crazy formation Attachment 6512

And now he's using this... Attachment 6514

I have a 1-0 agg lead. What should I do?

I play him tomorrow so he may change it.

It seems to me that your opponent want to go defensive and play counterattack with his AMC as a ball feeder. I think it would be easily to stop his AMC by controlling the midfield with 4 or 5 midfielders. And since he removed his DMC and now has only one MC, try hitting him in the center.

Would you say I should stick to the 4-5-1v?

Just looks like he's short of players and is putting his only available players into their preferred positions.
If I were you, I'd concentrate on putting my strongest team out, and not worry about countering his formation.

I have a lead so should I counter attack 4-5-1v?

the guy make me laugh .. and actually i think his tactics is genius :D
good luck .. not sure what i can say ... you sure need 4-1 DMC, then the QS is should you control the mid and play 4-1-4-1 / 4-5-1V or need more attackers, so 413W2? or attack him centrally with 4-1-2-3? .. am not sure

Your opponent will use 5 defenders, so I think playing with crosses from the flanks to your sole ST will probably like playing heads or tails of a coin. If I were you, I would go for 4-3-2-1 X-mas tree and attack on the middle with short passing. But it will depend on your current squad and your playing style.

I'll go 4-5-1v and hope it goes well. :) If I get an away goal he'll need to score to win 3-1.

Butterfly him, I had to face that formation in 1st game of CL and only had players to play butterfly due to injuries, I won 3-1 :) red arrows on both AMs and hard attacking.

He's changed it again!

Attachment 6574

I don't have DML or DMR as I rarely ever use them.