I suspect that teams in the lower half of the French league had better defences last season than we did.If every manager has thought Dier is much better than Rodon then surely that tells you everything? What else is there to say?
Again, we are not a charity. What kind of manager would select a worse player over a better one (in their view)? Players don't deserve to play out of pity. They have to show they are better than the others. Rodon didn't do that which is why he played last season in the lower half of the French league.