This goal was actually on Allegri's poor decision making.
Licht is the one who has the wrong positioning here. It's understandable, because Allegri made him play as a RCB after the sub - something he's not.
And Allegri made him as a RCB because he needed Cuadrado on the rwb, and also needed to sub Chiello. So instead of burning 2 subs, he did it with only one sub - pulling Licht to RCB and subbing Chiellini for Cuadrado straight up.
In the end of the day, Cuadrado clearly should have started, specially when you need crossing and wing play for 2 CFs upfront. That much is obvious. Allegri fucked it up, that's on him imo.
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I agree with you. As smart as Allegri is, he is indirectly defending his own poor decision of starting Licht, when Cuadrado was clearly the choice at rwb.
If he made that right choice, not only the offense would work better from the beginning, as reliant a CF pair is on crossing, but also Chiellini would have been subbed by Benatia. Licht made the mistake because RCB is not his position.