I definitely don’t think the first 30 minutes of the second half were good. They were pretty bleh. But Villarreal still created absolutely nothing and barely touched the ball. Even the penalty wasn’t a dumb mistake by Rugani (who otherwise had an excellent match) on something that wasn’t actually a scoring chance. I think we ran ourselves out of gas dominating the first half. And our bench lacked any quality (at least with regard to actually fit players with minutes in their legs) to change things. I don’t really know what the answer was after we failed to capitalize on all those first half chances. Allegri didn’t do a good job with his subs, too little, too late. But with what we had on the bench it was a tough spot to be in. Any subs made were a significant drop in quality (again with Dybala being half fit) and it’s not like we had high energy runners on the bench either.
Thats exactly my point, it's like he was either content with whats going on the pitch (I doubt it) or started already calculating those extra time 30 minutes for his subs.. Either way I thought that Emery out-Allegri'd Allegri here, in the 2nd half they played a perfect replica of the Barca-Juve match-up in the Cardiff season where we knocked out the MSN with similar tactics.
In regards to subs options I thought of (of course without knowing the fitness status of players):
Berna for Arthur and push Loca back,
switch sides for Cuads and MDS (Cuads side was way too crowded and MDS couldn't capitalize on 1v1 situations),
put Pellegrini on for MDS,
put Dybala on for Morata.
I really don't get why we didn't try anything up until we conceded, obviously Arthur was never going to provide that killer pass for Morata and Vlahovic. especially in the 5 subs era...