Even the best laid plans go astray. But Mikel Arteta could never have foreseen the catastrophe that unfolded before his eyes at Etihad Stadium on Wednesday night.
His first contest against his former boss, and mentor, Pep Guardiola got off to an ominous start when Granit Xhaka suffered a bizarre injury with a minute played, rolling his ankle after contact with an innocuous wayward pass and forcing Arsenal into their first substitution.
Losing their most combative midfielder set the Gunners along a path that would lead them to a comprehensive 3-0 defeat in their first match for 102 days. And while that may have been a well forecasted result even ahead of the game, especially given Arsenalās inexperienced starting XI, Artetaās game plan deserved better.
The Spaniard was wise enough not to take the fight to City, opting for a more pragmatic approach that wouldāve been alien to previous Arsenal sides. He effectively employed a 4-5-1 formation that congested the midfield while Bukayo Saka and Pierre-Emerick Aubameyang were encouraged to push forward on either flank in possession.
Leading the line, the pacey Eddie Nketiah posed a legitimate threat in behind that we didnāt get to see enough of. And even when Dani Ceballos had to replace Xhaka early on, the substitute settled in quickly and the visitors impressed for the first 25 minutes.
Enter, David Luizā¦
In fairness to Arteta, he was spot on in his decision to bench the erratic Brazilian. Just as he was equally justified in his omission of Mesut Ozil from the matchday squad entirely for ātacticalā reasons.
The Arsenal boss chose to put faith in ex-City owned centre-back Pablo Mari instead, but his injury opened the door for Luiz and his litany of errors. The away side started to lose their shape and within a few minutes, Bernd Leno took centre stage with a series of excellent saves that denied Raheem Sterling, David Silva and Riyad Mahrez in quick succession.
Artetaās meticulous game plan was falling apart, though, as Arsenalās defensive organisation deteriorated and things began to go down hill. Then Luiz grabbed the wheel and drove them off a cliff.
His poor decision-making allowed Sterling to fire home the opener on the stroke of half-time. A disastrous bit of play soon after the restart then saw him haul Mahrez to the floor, concede a penalty and receive his marching orders.
In truth, Arsenal were always likely to leave Manchester in defeat. But Artetaās tactics may have given them a sliver of hope only for Luizās calamitous nature to condemn them to a spectacular failure.
That, in a nutshell, is almost symbolic of the bigger challenge the young manager is faced with.
He has the right ideas and a clear philosophy that would appear aligned with Arsenalās long-term goals. Plans, however, are only as good as their execution.
The unmitigated disaster Luiz instigated at the Etihad didnāt just leave Arsenalās goal exposed, but their recruitment strategy as well.
The 33-year-old centre-back clearly doesnāt warrant a starting berth but arrived for Ā£8m ahead of this season. Even Flamengo loanee Mari doesnāt appear to be destined for a lengthy stay in north London while Shkodran Mustafi has been below par as well. An injury to Sokratis Papastathopoulos shouldnāt leave a club striving for Champions League football in such dire straits.
Yes, William Sailba is due to join their ranks from Saint-Etienne next season, but his arrival would still see them lacking in depth. Meanwhile, the clubās hierarchy splurged Ā£72m on Nicolas Pepe ā who didnāt make it off the bench on Wednesday night ā last summer to add more weight to a top heavy team.
The top four remains Arsenalās objective, but the reality is they simply arenāt equipped for Champions League football and while another season outside Europeās elite competition will have a significant impact on their finances, it may force their hand in terms of losing dead weight.
There are no quick fixes in this game, especially in the Premier League where the competition is fierce. Arsenal must embark on a painstaking rebuilding process that will procure the right players for Artetaās blueprint to take shape and rid themselves of personnel who arenāt capable or inclined to meet requirements.
Failure to embrace a careful recruitment process with patience and faith will render their new managerās ambitions at the club inconsequential.
Luiz may have caused a car crash against City, but in doing so he unveiled a deeply-rooted and far more serious issue that Arsenal can longer ignore.