I cant wait for mendy to be fit for a stretch so people can shit up about him not defending. Its horseshit.
If you play him like a LB he can defend brilliantly as seen in his 2 games vs Salah.
If you tell him to play as practically an extra LW then yes, he will leave space behind.
The only genuine problems Mendy had defensively was nailing down the transition from CM to LB in a few games when Pep wanted him to come inside - which all our fullbacks had problems with at first.
I hope your right.
Looking forward to the big fella getting fit, although after waiting for two seasons I am not so sure.