One thing most fans don't understand about Akanji is that he's an ideal squad player from Pep's perspective. Why? Because Pep wants to work with a small squad and for this purpose he needs players who are generally available and versatile. Fit and versatile players can play multiple positions, so when we have injuries, they can step up.
Akanji fits both requirements: the player with most appearances over the last 3 seasons and the only defender who is versatile enough to play across the entire defensive line, from RB through CB to LB. He played too many minutes due to other defenders being unavailable, which caused a dip in his form. This is kinda obvious.