My 2 cents on defensive systems.
According to me, of the top teams Liverpool will ship the most goals this season, because of low possession and the high line and exhaustive pressing of their tactics.City will look Vulnerable for their high line, but won't concede as many as say a Liverpool because of all their possession(ala Bayern).Man Utd and Chelsea will be water-tight due to their manage's tactics(mind, they will still score bucket loads of goals, just not as many or in as spectacular a way as a Liverpool or man city) Leicester will stay tight defensively, but won't score as many as they did at the start of last season for the simple reason that teams respect them more and they can't just keep grinding 1-0, 2-0 wins all the time, so I'd predict them to finish no higher than 6th.
The way Leicester's season played out last year was eerily similar to Chelsea's, Chelsea were just a little more commanding at the start.If you take off all the fairytale around Leicester, they started the season playing fast paced counter attacking football, Chelsea played attractive football too, just had more possession due to their reputation.The second half is where it gets even more similar.Both teams knuckled down and started grinding 1-0, 2-0 victories, Mourinho didn't offer his team pizza, but they did keep a lot of clean sheets.I don't know my numbers, but iirc Chelsea lost just 3 games and so did Leicester(though Chelsea's last loss came after they'd already won the title, against West Brom).
tl;dr: Take the pizzaz out of Leicester's season and you get a replica of Chelsea 2014-15
The point I'm trying to make is that such a defensive style of grinding wins is not sustainable, this is the mistake Mourinho makes every time he manages a team for 3+ years, the lads get bored of the style and then he tries to fire them up using the media, wields the hair dryer, alienates the team and finally has to leave. Ranieri needs to not make the mistake that Mourinho made.He needs to come up with a new system, freshen things up and play a more sustainable and fun form of football, else they'll end up just like Chelsea.