City offloaded five ageing, long-term servants since the end of the season - including full-backs Gael Clichy, Bacary Sagna and Pablo Zabaleta - along with Jesus Navas and 'keeper Willy Caballero.
Indeed, 31-year-old Clichy and 34-year-old Sagna were City's most used full-backs last term, yet the former Gunners never fully fitted Guardiola's style with the City boss experimenting with no fewer than seven different players in the wide, defensive roles.
So replacements and an injection of defensive youth were to be expected, but racing full-backs, or wing-backs, are almost as coveted as a defensive midfielder - and Walker's switch has broken the world record transfer fee for a defender.
The fee is inflated by his 'homegrown' status, as Guardiola seeks to satisfy the Premier League ruling that requires teams to have a minimum of eight 'homegrown players' in a 25-man squad - but big fees rarely deter Manchester clubs.
Previous Englishmen have struggled at the Etihad, including the likes of Jack Rodwell, Scott Sinclair and Fabian Delph - but Walker is more than a squad player to appease quotas.
The England international will almost certainly be a guaranteed starter next season and significantly increase City's already lethal attacking threat, while bolstering defensive weaknesses with athleticism to track back.
Guardiola's perfect start in England fell apart during October last year, primarily due to defensive and goalkeeping frailties. Those recurring stutters in form cost the Spaniard a genuine title challenge during the closing months.
However, with new keeper Ederson signed from Benfica for £34.9m in June and, potentially, one of the league's most formidable full-backs added to the ranks, Guardiola is setting his stall for a title-challenging second term.
Walker is far in front of his counterparts for attacking threat, dwarfing City's full-back stats for assists, crosses and corners, dribbles and chances created, while also surpassing them for duels won and tackles.
All four of City's most used full-backs only managed one assist between them while fulfilling the role during the entire campaign. In contrast, Walker racked up four from the flank and another from a central position.
In total, City's full-backs and deeper wide midfielders only registered seven assists, despite attacking primarily down the flanks - which suggests excessive dependence on the attacking wide midfielders.
Guardiola primarily used a 4-2-3-1 or 4-1-4-1 formation last term and the graphic shows that Walker will occupy more prominent attacking positions, supporting and overlapping Raheem Sterling or new signing Bernardo Silva down the right flank.
Walker will also stretch opposition defences wider than achieved last season, which could also open pockets of space in and around the box for the likes of Kevin De Bruyne, David Silva, Gabriel Jesus and Sergio Aguero.
City had a league-high 79 attempts on goal from corners last season but only scored five of those. For comparison, West Brom scored a league-high 16 goals from just 58.
However, Guardiola's men scored 14 goals from crosses - bettered only by Crystal Palace (20), Liverpool (19), West Brom (19) and Arsenal (18) - and Walker would undoubtedly boost this figure, in addition to creating space for attempts in central positions.
Out of the six full-backs, Zabaleta covered the greater distance on average with 10.88 km per 90 minutes. In fact, Walker recorded lower figures than all of City's full-backs, with the exception of Sagna.
These greater distances are likely to be a result of Guardiola's physical demands on the pitch and the 27-year-old will be expected to cover a greater distance in Manchester.
However, Walker surpassed all of City's full-backs last season for sprints per game and a top speed at 35.18 km/h - a league high for Premier League defenders.
Player Km per 90 Sprints per 90 Top speed km/h
Kyle Walker 10.44 67.03 35.18
Bacary Sagna 10.36 47.44 33.69
Gael Clichy 10.59 52.43 33.94
Pablo Zabaleta 10.88 60.17 31.93
Aleksandar Kolarov 10.77 51.34 33.39
It could be argued that Chelsea and Tottenham's wing-backs or full-backs separated the teams from City and the rest of the chasing pack last term.
Guardiola only used a three-at-the-back system in the Premier League on five occasions, but Leroy Sane and Sterling do not possess adequate defensive qualities.
Walker will provide Guardiola with a three-at-the back option - having played the wing-back role at Spurs.
Guardiola's defensive overhaul of youth and attacking intent could prove to be the difference if City are to dethrone Chelsea and win the title next season.http://www.skysports.com/football/news/11679/10947248/what-will-kyle-walker-offer-manchester-city-we-check-the-stats