When Manchester City dropped points on Saturday, it gave Arsenal fans a small glimmer of hope.
The WSL title race may be out of the Gunners' control but, if they can win their two games in hand, they will be breathing down City's neck when Andree Jeglertz's side meet West Ham on what could prove to be a nervy final day of the season.
Aiming to reach a second successive European final, Renee Slegers opted to rest Williamson, Lotte Wubben-Moy, Caldentey, Caitlin Foord and Alessia Russo before the second leg of their Women's Champions semi-final against Lyon on Saturday.
But the European champions demonstrated their strength in depth and asserted complete control in the opening 45 minutes as they cut through Leicester's defence with ease.
As if the Foxes needed more trouble, Slegers called upon Russo and Caldentey at half-time, while Williamson and Foord were brought on after Olivia Smith and Emily Fox picked up knocks.
Caldentey showed her quality with a sublime curling finish before Williamson's glancing header fizzed past substitute keeper Katie Keane.
The Gunners have not lost a league match since October and another convincing victory will not only boost Arsenal's confidence as they head to Lyon with a one-goal advantage, but it will also serve as a fierce warning to league leaders City.