I feel Ranieri kept some if his players back for more important games to come, and played a good enough hand, in what is just the Coppa.
An away goal is excellent, no doubt.
Only being one goal behind at half time is also excellent too.
As for making mistakes, well hindsight is a great liar: most here were calling him a tactical wizard when he took off Momo (who had a bad-hair-day) for the boy. Alas the boy was no small way part to blame for their goal. At the time of subing though, it seemed a good strong attacking move.
Gio, had things gone differently may have come on, but let's hope, Ranieri will have him and Trez back for the sharp part if the season, which thankfully we are still very much a part of.