Lichtsteiner is terrible offensively. If you want to maximize the 3-5-2, you need wingbacks who can play offense because today the only offense we have are the 2 strikers, the rest are either defenders or central midfielders. Licht is a great right back in a back 4 but I think for our team to take that next level we need someone who can offer more offensively. Now whether that's Isla or not is a different discussion but if Isla could go back to the way he played for Udinese, he'd be a starter for us.
And if we do end up playing twin towers in Llorente - Zlatan/Higauin, then forget about Lichtsteiner and his terrible crosses.