I don't want to change this in to a Kante discussion as I know Drinkwater is the talking point but Kante was the most important in that 15/16 team. The fact he could defend and attack in equal measure and do both as superbly as the other meant he could run most games from that midfield point. And not to the detriment of Drinkwater, but Kante could probably play a game by himself in midfield and come out on top. They were the perfect pair. When one would go forward, the other would know to hold back and support in case we ourselves got countered.
I actually think Drinkwater would benefit more from going forward and not being restricted to stay back or defend as a priority. He's got a quick mind which means he can read the game well and assess danger, so to speak, so if you were to get countered against, he would know where to be on the pitch and have the energy to get back and support. He'd end every single game absolutely knackered but that's only because he gave so much to the team and almost always gave 100%.
Most sensible Leicester fans recognised that when Drinkwater played well, the rest of the team usually did because he's such a workhorse and so tireless in the midfield. He'd work so hard up and down the pitch it meant that the creative players were free to express themselves - much like Hazard can (he'd probably do that anyway tbf) and Mahrez does for us.