For all the crave about Maguire, Mawson..., take notice how they were less impressive toward the end, when the game was opened up and there were more space for them to cover. Clubs who go for the win, would be subjected for leaving more space at the back.
For example, Lukaku chance seconds to the final whistle. Maguire clearly fell asleep when Leicester had to pushed up the pitch. Leicester at this point had nothing to los. If it were at bigger club, it would prove to be much more costly since they may not goals down at that moment, but they had to push for better result. A mistake like that would mean losing not 2 points but all 3.