Well, bar LB and a controlling midfielder/ DM, this is the strongest squad we've had across the board for me since probably the last treble winning season under Houllier in 2001. I think what you'll see is the back 4 more or less remaining the same most every game, with probably Can guaranteed in front of them. But it's the multitude of options in the attacking positions that really excite the **** out of you and where I can see changes be it down to fatigue, the opposition, injury et all. So to play on your point above, let's say Phil has been in for 3 or 4 straight games and his 'explosiveness' drops, then he'll be switched out for a few games for someone who is right up there fitness wise ready to give that.
The kicker for the first couple of months at least is Karius breaking his hand. We've now gone from the second best 'keeper the Bundesliga last year behind Neur (as voted for by his fellow professionals), to the single worst long term goalkeeper I've ever seen in red back in nets. All through a spell of Arsenal, Tottenham, Chelsea away and last years champs Leicester and United home.
He's the wildcard through a mega tough start to the whole year as no matter how well everyone else plays, you can't legislate for his inevitable f-ups every game. Just praying the pressure on him for the first time from Karius that this could be his last spell in our goals has made him up his game.
The f-up against Roma wasn't a promising start.