Arsenal were 2-3 down with 11 minutes to go, but super-subs Aaron Ramsey and Olivier Giroud propped up with a goal each to give the Gunners a great win. However, Arsenal and Liverpool could well have something to say about that, especially if the Wembley factor derails Spurs.
It also freed up the Gunners' forwards, whose goals propelled the team to an end-of-season surge, culminating in an FA Cup final win.
It was Vardy again off a corner kick in early goings of the second half who put Leicester ahead, but as the minutes rolled on and both Ramsey and Giroud came on, it looked like Arsenal would get at least one back.
Vardy was then afforded far too much space by both the Bosnia global and Monreal for Leicester's second, after Holding had failed to block another Albrighton centre. However, Leicester could prove to be tough opposition, especially if Alexis Sanchez and Mesut Ozil are out, as expected.
"Every manager's nightmare is to lose players in the last 24 hours or on the day of the window (closing) and you can't get replacements in", Shakespeare told reporters of the August 31 transfer deadline day.
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Wenger's gamble to field a back three featuring one recognised centre-back collapsed in a display of complete defensive incompetence.
It was then Jamie Vardy's turn to shock the Gunners as Marc Albrighton's brilliant cross left the Englishman with an easy tap in to take the lead. Vardy knows how to score against Arsenal. "He is focused and happy in the dressing room because we won the game".
If the Premier League this season is going to be a case of start as you mean to go on, we're in for a treat.
The 23-year-old used fantastic pace and impressive technique to regularly have a go at striking the target, but was unsuccessful. You do not get that from most poachers. During most of the game, the team's defence left much to be desired - that Vardy managed get past six defenders to score his second goal is testament to that.
For most of his career Lacazette is a man who has been in the right place at the right time and it seems he will carry on that trend at Arsenal.